I bought a written off 172.
I then took the engine, box, driveshafts, brake calipers, discs, hubs, radiator etc all out of the 172.
It all bolts straight in.
Wiring loom needs to be made yourself. (I cheated and bought one off another member)
You'll need a different alternator bracket (Renault 11 iirc)
send a pm to f0xy. He's got a website dedicated to it.