I may be able to help the OP out. I need to offload my 163. It's failed it's MOT on smoke (I can't see any) and I cannot be bothered to do any more with it (I ran some injector cleaner through it and gave it a good service with genuine MB oil which didn't work, it failed again). Most of the problem is the fact that it hasn't been used for ages and I want to get rid before the insurance needs renewing next month.
As the car has had new bilstein shocks all round in the last few thousand miles, has good matching Continental tyres with c.6mm tread on (235, not 275 too), a westfalia detachable towbar, new quality battery (due to lack of use), remapped to approx 210bhp (Transformed the car), nice double din DAB radio, "inspiration" spec AND it actually runs all the time. Bad points are bodywork related (Most panels have rust or marks, rear bumper has a hole, replacement bumper in the garden!). I am sure it makes a better base as a project than the OPs. Open to offers!
Otherwise, good luck with your plans.