Thanks! I didn’t add the other types of BBS as there are many more than just those other two. They were just the ones that popped into my head. BBS is simply a “base” (it dilutes the base) so there are so many possibilities. BBS Silver Birchen for example is another one.
If you are interested in any dimensions, I can measure and send to you. It was built by a friend and his crew; beyond the basic sketch, we pretty much talked in person and worked out things on-the-fly. But I would be happy to share any details! It has held up well, though there are a couple of changes I might make in the future.