Using a FWD Engine?

[acra]

Just coming back to this, does anyone know of somebody building a Haynes/7 roadster using an engine originally from a FWD?
I'm still interested, as it makes the choice of engines far greater. I'd probably stick to the Sierra to begin with, for simplicity - but if I wanted to use an old FWD engine later down the line, I'd have to modify the chassis sooner rather than later.

Are there any build diaries or anything?
I'm just trying to think logically, it can't be much more than rotating the engine to longitudinal, then mounting it to an appropriate gear box - for that matter (at the risk of exposing my newb-ness), why isn't it possible to use an original FWD gearbox, mated to a RWD drive shaft?