That’s a real shame Pete,some people are tw4ts as you say. I had some similar damage on a BSA Cadet and it is repairable but very very time consuming,I set up my mig welder so you could bit by bit build up some weld into the areas of missing metal but without the weld penetrating too far. I was worried about warping so just went very slowly and moved around areas. Once done some careful dressing back and the damage is virtually non existent and certainly ok enough for a humble Cadet. Atb Phil