Is your avatar from Joe Bar Team, or some other cartoon series?
Either way,
As to your question, one person here is doing the Busa FE swap and I don't think he's addressed that yet.
Click here and see
gdavis2265's post at the bottom, he's done the Busa FE swap.
It is something that's been dealt with on GSXR FE swaps too, so here's some more reading material for you:
B4 Front End SwapsFront End Swaps(The above two are in the 400/250 section, but they use the same candidates for swapping as the bigger Bandits and have the same length steering stem, so what applies to them, applies to the bigger ones, too.)
This one has some pictures of the mods done to the triples to make the steering stops and ignition switch fit in a GSXR1100 set of triples.
Upside Down Forks and clipons who's done itIf you haven't bought the front end yet, you might want to consider the longer GSXR1100 fork. The Busa fork is quite a bit shorter than the B12 fork, where the GSXR1100 is about the same.