Peter, some parts I'm making, others I'm restoring , the lamp bracket has had a few coats of primer and looks serviceable now compared to post #1, I've kept all the pics so far..... I'll update the Matchless thread, the Petrol tank is the only thing that I've used filler, small parts etc will have the same process as the frame above but the bonus of phosphate too.... all the engine bits are now ready to go, just need to give the outside of the crankcases a blast (these are 1942 replacements)

The tracked Motorcycle you mention was the Kettenkrad, that was a project and a half and the owner a skilled tin basher........