There are several free cad programs out there - even for Linux guys like me.
Heck I'd stick with some fullsized drawings - head to Home Depot and get their red rosin or brown building paper and work on that. Get a piece of wood trim or a 3/8" x 3/8" x 8' long stick to use for fairing your lines from point to point. Measure from a center line and use that to determine how to build your building form for the fiberglass. Look around at older traditional boat building articles about "fairing"; you might find some good ideas there.
You could kamm the back behind the rider possibly instead of a long tail - it would make it less susceptable to cross-winds and could be used for helmet storage etc.
Those Enfields are nice little bikes, I haven't seen a diesel yet - are they loud?
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