Hey Bob,
You can definitely use the fuselage for the taildragger, there is no difference in fuselage for the Q-200, Q2, or Tri-Q.
I'm not guaranteeing that you can split the spar, I haven't seen it in person, and I don't know you from Adam.
But I think it could be done, at least it makes sense that it could be done. IMHO.
Who knows, you might even find that the spar is rigged properly when you get it. Then again, you're always trusting the work of the previous builder. Hope that makes sense.
I think the kit would be a bargain at whatever you can negotiate. Then again, I am the editor of the Quickie Builders Association! LOL!
Hope that helps. Please let me know.
Thanks,
Dan Yager
QBA Editor
www.quickheads.com