Not worth it IMO.

My mate bought a nice 3dr GTi for £1050 recently. 17's, lowered, exhaust, no rot etc.
A 5dr needing work thats gonna stand you £800-£900 finished aint a bargain.

Nice runaround tho. If it goes bang, whack a 2 litre straight in, instant power upgrade.
3dr just needs interior and wheels, and its an RS2000 to the untrained eye.