slow down...I've got too much to think about. I'm in the middle of working on merging. Once the merging script is done...then, to put everything into a subforum, you would just merge that BB into yours, and move all the forums into the subforum, therefore creating a subsubforum, and a subsubsubforum
vB can do that...so don't worry about the levels getting too deep.
Merging is coming along nicely...Expect the merging version to be released in 2~3 days.