This is interesting, I always liked this Aircraft, the full scale version, except for the hot running problems with the rear engine. The size of this model aircraft suggests that the wing loading is going to be a big problem. If it was sized for two .45 glo engines and they don't give the wing area or the wing loading, I would email them and ask what these two specifications are. Knowing these two numbers will help a lot in evaluating the possibilities of the project. I would guess that at 13.5 pounds this airplane doesn't have the lowest wing loading to begin with.
John