I hope there's something left to rebuild after all that hammering! It's not uncommon to bend rods, or damage the crankshaft with a lot of brute-force disassembly. Have all the parts checked for straightness/alignment by a good machine shop. It's slower, but a lot less stressful, to soak everything with a good penetrant like Kroil, and carefully break the parts loose with a pry bar at the flywheel and a hardwood block and a big hammer on top of the pistons, freeing up the rust bond between the rings and the cylinder walls.
Jerry
