This is up for sale again!
I've heard the seller is not so great to get on with...but I don't know him so I won't judge.
Anyway, I'm not sure where the DVLA stand on re-using an existing tub as part of a self built kit car. With a space frame you need a certificate of newness from the manufacturer to pass the IVA test in order to get it registered. This of course will not have that.
It could definitely be used a track car, and even rebuilt as a 430 with the right parts.
I'd even try and put in a V10 or V12 if it could be made to fit!
I think get it road registered would prove a real PITA though.
I have considered having another space frame constructed, based on my Gallardo space frame, but for the wheel base and track of say the 430, drop in the audi V8 and RWD box (as I've done in mY gallardo rep), and plonk one of Extreme's 430 body's on top...?