When I did mine it was really easy as it has a live rear axle. My locost is almost completely flat underneath. The diff' casing pokes through a
8 x 4 inch hole by about 1/2 inch. Axle movement is very small and it's handy for a trolley jack to be used. There are 4 tapered aluminium fins
underneath, bonded and riveted in place. The difference it makes is huge and was well worth the effort.
With independent suspension you will have more gaps to allow for movement, so I think I would make a card template first.
The rear section (under the axle) I made out of 1.2mm galvanised sheet, I just happened to have, was intended to be a template. When I made it to the
correct shape/size, it actually didn't weigh much so it went on! It has been on a year or so now and working well.
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