Those are pretty well drawn plans by somebody. I heard from someone in South America who wanted a copy of what I had. He had the same plans annotated in Spanish. He sent me his file but it wouldn't open.
If you go here and look at post 137 you will see a good reason to build your own and not trust the ARFs:
http://www.rcuniverse.com/forum/m_45..._6/key_/tm.htm. There's no way I'm buying a Funtana built that crappy. Maybe your Katana is also built much better and stronger???
I have a lot of wood sitting here just for building. Why not build it? The only costs to me would be the cowl, canopy, and control horns. I think I have everything else here now. Way cheaper to scratch build it.