[AlexBp]

Can I intervien a little
not to put a downer on things but think about this a second

vtec saxo isn't easy
custom engine mounts (if the Rex is that destroyed then I doubt you can cut them
out of it to use)
custom driveshafts
custom gear linkages
custom fuel lines
custom breathers to tank and brake servo
the exhaust will need to be custom too
then the wiring
aswell as bits like coolant hoses ect all need thinking about

all 5 vtec French cars I've seen have been track use so have no heaters ect in them so that reduces half the work in making them work

and then try get insureance on a car like that with that crash on record and possibly points

sorry but there's my input
it would be a cool car
but I think your dreaming unless you don't plan to do it for a few years