Tell you what, bige built one for lil_1200 some time ago (bored and stroked A12) and the engine was later put up for sale. Last time I checked the engine had a knock and the seller was quite negotiable on the price of the engine.

If it's as simple as a new set of bearings and a tickle up of the crank journals you could probably get yourself a decent price.

Otherwise send bige a pm about getting one built.