heres a good starting point, you could then cut it down to fit in a modded cover and etc etc ? http://cgi.ebay.com/Lexan-Polycarbonate-clear-1-sheet-1-2-x-12-x-12-/220754066116?pt=LH_DefaultDomain_0&hash=item3365f7bac4
yeah lie the ones they make fro banshees are sweet
says they use lexan for the covers: http://cgi.ebay.com/ebaymotors/Banshee-Lock-up-clutch-cover-Lock-out-_W0QQcmdZViewItemQQhashZitem19c47b6e0dQQitemZ110670605837QQptZMotorsQ5fATVQ5fPartsQ5fAccessories
that looks like it would be a good engine, but i think a motorcycle engine would be better, somthing with two or more cylinders, woudl be heavier, but lots more POWER!!
problem is those efi's systems dont have anyway of adjusting how much fuel with out being a complete hacker and what not. so you cant really adjust he fuel ratio on the 440s with efi