Other possible (but more expensive) donor cars?

[3GE Components]

Caterhams would be a good donor, it's almost made for the job

Seriously though......

Our demonstrator is going to be Nissan powered, but only the N/A version, we're aiming for 200BHP.

Later Saab turbo units will fit on the Omega box without too much hassle.

Geert at AlphaX does a conversion kit to mount the Audi/VW 20v turbo unit to the ford box.

And don't forget the MX5 is plentyful now, bound to be a few in the brakers.