I've heard of High Schools Students that have 'pickup' modded the Geo B4, so we know it can be done - and the eBay pic Proves it - and - hey it's a mod that (probably) saves on weight! So - that's better at slow speeds - less weight to accelerate = more eco friendly - hence - here we are on 'ecomodder'!.
It the AeroCap was made lighter weight than the stock - I am betting your aero would be better, and your weight penalty would be small over the current (pictured) style of pickup mod. You could make it wiith foam -
like mine essentially - then fibreglass it using epoxy resins, and then - just disolve out the foam with some old Gasoline! A Bit oa a small RC Modeler Trick for small Airplane fuselages! Robert