Retro you will have to excuse my scepticism.
There is no way your swing arm and mounting points can be structurally sound, looking at the damage to the wheel.
My gut feeling is that a good local engineering company should make up the components you need and they would probably be better than the originals.
My 3w had a 10 to 15 mph shunt up the back end and it rippled the whole body back to front. New bodies are around 6k believe it or not.
