That Red 34 with the Gen-TT LS1 is Australian.Built by GT Autosound in SA for the Drift Australia series, so it can be done. There is a few build pics on another forum. So it definately can be done, but i dont think u would get it done for less than 20k, alot of hours would be involved.
There is a bloke in the UK putting an LS1 into an Astra, so im sure with a bit of massaging you could get it in there no worries, just depend on how deep the pockets are, but if it makes you happy, then why not