Not in order:
- Top swing derailleur on there, can't fit a normal mech.
- If the cranks have no cracks (usually at pedal eye or axle boss), aren't subject to a recall and don't loosen off in use, they are fine for reuse.
- Cranks can be de-anodised and polished but not all Al alloys are suitable for polishing and clearcoating the polished cranks is probably a good idea.
- I don't think that M361 rings will fit that crankset, due to a different BCD/ PCD. Very limited chainring options for that crank.