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updated 22/03/2020
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Custom built three wheeler cars and kits
click the images above to enlarge, download, and print as a brochure


click on any of the pictures above to go to the gallery  
Remember...superb aluminium bodywork...with 120 louvres,... not just fibreglass!


This page is for ideas and tips that we think might be of use in general, and will be updated periodically. It will eventually be incorporated very shortly into the MG3 kit construction manual.

1) If you are building a kit or about to build a kit, particularly in the UK, it is essential that you obtain a copy of the MSVA  manual. The manual is downloadable here

Motorcycle Single Vehicle Approval Inspection Manual  There are also alternative documents about SVA in general, which are not applicable to three wheelers and of course we shall give you guidance, but the official manual is the bible.

2)  For fixing aluminium panels prior to final riveting, position and hold with " Cleko" clamps. They can be found via the link below. We use 3.2mm clamps, and don't forget to order the setting pliers. A supplier of "cleko" clamps is LAS Aerospace   you might find they general catalogue very useful. you'll want the 1/8inch (3.2mm) types, coloured copper.


3) We use a lot of riv-nuts also known as nut-serts. We use M5 and M6 riv-nuts and recommend torque control for steel not aluminium riv-nuts. Now when it comes to riv-nut setting tools, only the best will do! We've broken small hand held plier types, both Gesipa and Blue Point/Snap-On, neither are man enough for M6 size riv-nuts. We use a long handled pair by Sealey, and a magnificent ratchet riv-nut tool called MASTERFIX MFX 612S, and it can get into very tight spots where other setting tools simply can't! Masterfix tools can be purchased from Primary Fasteners

4) The above picture shows a set of Rotabroach mini cutters. These are absolutely invaluable. They are mini hole saw cutters that cut an extremely fine hole up to 8mm deep. The sets go from 8-20mm but sizes in 7mm and 9mm are also available, together with other intermediary sizes. 7mm and 9mm respectively cut holes for 5mm and 6mm steel rivnuts. Beware, here, I buy all my riv nuts in from Torque control so I know that these work well. Other manufacturers' riv nuts might require different diameter drills. They are excellent in aluminium sheet.

There is no substitute for a right angled drill. We use Metabo drills and grinders throughout.

6) Do not fit the one piece aluminium floor until all holes have been drilled in the tunnel side rails. If you do fit the floor first, you will have to use 1 inch aluminium angle riveted to the tops of the tunnel lower rails, as you will be unable to get a drill, even a small right angled one, into position for drilling.

7) We supply the one piece floor loosely fitted anyway on 11 M6 bolts and rivnuts, so you can indeed lift the whole assembly on to trestles with the floor in place, and lower the floor gently in places by removing appropriate M6 bolts to enable you drill holes for the tunnel sides and rear pannier sides as shown above. The floor is a useful "shelf" at this stage, but remember 5) don't finally bond/rivet the floor until you are absolutely ready.

Click on the pictures below to enlarge. Rivet the floor at 50mm centres all around using 4.8mm rivets.


MG3 Hagon rear shock absorbers  click left to go to this page.

Rear wheel cover:

We cut and supply panels to box in the rear wheel. These panels are bonded and riveted together (by you, if you've purchased a kit). There is a removable top and two removable side inspection hatches.


You can see the top hatch in position, and the front lower hatch is missing. The rear lower hatch is permanently riveted into place. Note the cleko pins holding the panels together, and the pre-inserted riv nuts. naturally, where you see cleko pins, and in every other hole shown (except riv nuts), you will be bonding and riveting. You can see from this shot that the rear wheel can be fully enclosed. You have excellent access to the swing arm bolts via the foremost lower hatches, and you will have access to the rear shock absorber top bolts by removing the riv nut held upper hatch, you can then lower the swing arm for maintenance, wheel removal etc. You will need to mastic around very small joints in places to fully water proof this area. The aluminium panels are shown PC2...poly coated both sides, you should pull this off prior to bonding and riveting.


These two views again show  top and lower side access. Note that the upper seat belt anchorage points are now outside the wheel area and cannot be covered in road filth. Ensure when fitting seat belts, that  from this upper anchorage point that the left  bolted belt goes to the right side of the car and the right bolted belt goes to the left side of the car.

Do not finally bond and rivet any of these panels into place and this includes the floor, until you have at least trial fitted all mechanical components, and that you are happy with fit-up.

Incidentally, and this is a very important point; the barrelback model in particular has the best luggage carrying capacity of any three wheeler.   

Trim and modifications:

Click on the pictures below to enlarge. It is necessary to have a radius at the right angled joint of the vertical sides and the horizontal decking. This can be achieved, by simple rubber or plastic rounded trim "Morris Minor wing trim" would suffice. better looking trim is the aluminium "J" section strip available from your local branch of Aalco or Blackburns for example, or other specialist aluminium suppliers. We fit this aluminium trim using 5mm socket button head screws into countersunk riv-nuts. Note the shape of the end nearest the scuttle. This is obtained by placing the section under the scuttle, drawing around it, then shaping it with a metal grit sanding disc attached to a grinder. We use a Proxxon miniature grinder for this

New chassis/body modifications:

Click on the pictures below to enlarge. The front panel each side is now removable. We weld a battery holder frame to the left front chassis side which accommodates a 038 size battery. The shaped front panel is held in place by M6 socket button head screws into concealed riv-nuts. These panels are now louvred with 6 vertical 200mm louvres, which looks very vintage, and are now standard in our kits.

New barrel-back rear panel.

Click on the pictures below to enlarge. Rather than use a plywood rear panel, we now use a 3mm thick laser cut aluminium panel which has considerably better fixing properties, and can be polished of course. The new rear lighting panel sits the rear lights at the correct height for MSVA regs. The standard lighting board now has Aero Cycle Cars cut into it.

click on any of the above pictures to go to the gallery
Honda, Moto Guzzi & Harley Davidson engined V-twin trikes

Replica Morgan three wheeler kits and cars, trikes, specialist sports cars and kit manufacturers of the original BRA CX3 MG3 & CV3 cycle cars