i was looking the other day in the shop and did find the haynes single seater book!
its using a motorbike engine mid mounted and is real light buy the looks of it
its going to be my next build for my son to drive
on a serious note your plans look like it would be a realy long car by the time bodywork had been added
a transaxel would be needed or some form of diffrent powerplant/trans arangement.
my own line of thinking for a single seater was be ditch 1 rear wheel use a bike engine and swing arm to build something very small and light then you get an msva not an iva