Steve, you sure u'll get a log book for the car from the MSA? it'll surely be K37 cat 2 logbook??

The elements of the WRC engine arn't particular hard to understand, all the engine builders you have named will be capable of producing a decent motor.

It would depend how authentic you wanted to be? i'd be ditching the WRC inlet plenum only run 4 injectors, spec a different turbo as the ancient IHI is a nightmare to maintain, put an alloy block on it...the list goes on...lol

Porting the WRC isn't as radical as a decent track motor, elevate the compression ratio, long rod, nikasil liners, lightweight valve train....

I know things are slightly different in Ireland but i'd be running it all past a scruttineer before going to far with building a rally car as you maybe planning...