Wouldn't have space constraints I guess, they can fit a Cummins 6BT in the damn things which is a 500kg+ engine and close to 1m tall, this was my 6BT I had:



If that son of a bitch fits in there an FG I6 would no worries, the electrical side of things would be the most difficult part for sure, he has a parts car though so it might be easier to swap all the looms and bare essential modules over and as FPV GTHO said disable the security features.

IIRC don't they need the cluster to run?