Stunning work. This is what makes a BOTM for me, not throwing money at ebay but really putting your heart and soul into it. You can't buy passion, enthusiasm and attention to detail like that.
One source for odd spares might be Venhill in Dorking, Surrey. They were the Magura importer in the 80s and 90s and occasionally list stuff on ebay like NOS levers and the like, maybe they have some decals or other parts spare.