Actually I'm not planning on building a turbine powered one, at least not yet anyway!
What I did start last year was blowing the plane up 150% for use with twin Byro setups. The span is about 72 inches I remember correctly. Then I got thinking about if it had a single turbine on it instead. Of course I can't afford any type of turbine but I thought about maybe trying it anyway and then if a turbine was to come into my future someday, I would be ready for it.
I thought it was a pretty cool idea and I may still go ahead with it. I already have the fuse sides cut out from door skin ply, and one of the double fan formers made. Of course I wouldn't need them for a turbine model, but still good to have them just in case I do the twin DF.
Myles