My friend Martin came off his BMW Boxer a few months back and although he was ok the bike suffered a reasonable amount of damage with the more he dismantled the bike the more he found, including a frame that had to be scrapped. Acquiring another frame he has set to rebuilding.
Lumiweld has been around for years and I have been tempted to purchase a kit,but never have. Martin has and has put it to some use to repair the gearbox end casing. He's machined off the damaged section made up a new piece and lumiwelded / soldered this on with seemingly great success.