Custom mounts, LMFAO.....
Will need the engine, box, not sure about the subframe, loom, front suspension set up, valver (or better) front brakes, don't worry about rears, useful to get oil dials, fuel pump, ECU, think you'll be ok wiht driveshafts, think you might need valver hubs though, valver bonnet, and so hence ph1/2 front lights, radiator(?), obvoulsy all the encilaries, mounts, alternator, inlet/exhaust manifold, downpipe etc etc, might also pay to geta valver exhaust, iirc its a larger bore
think thats about it, sure there are a few more things though.
ost wise it woudl be cheaper to get a valver, but depends what you have done to the 1.2 shell and whether you want to doan engine conversion or not