That thing is massive! Now I kinda get why you went with a factory made ATC, a horizontal diy atc wheel would be impractical at this size. Do the guys machining this beast have a website? I went through a lot of machining shops and frankly the cheapest quote I got was from a french shop, even with shipping it's 25% cheaper than the cheapest quote I got in germany, so might as well look at shops all around europe.