Just do it, you have the base sitting there anyway
http://www.greatbritishsportscars.co.uk/wp-content/uploads/2013/02/GBS_Zero_Mazda.pdf
Got sent this link. Would seriously love to do one of these
Tell you what that's not bad money at all!
Would it be feasible to take the rear end of the donor car and make it into a trailer to tow behind the mx5 for when you need extra luggage space?
I think those 1.5 car combos look great lol