Bill,
Thank you for your experienced input on a twin project.
Northeast Aerodynamics has some great designs. I have a SportAir .60 (scratch built from SportAir .40 plans blown up to .60 size.) It is an absolute delight to fly and land. It literally lands itself! Just get it over the end of the runway and let go of the sticks!

I'm sure that the TwinAir flies just as well.
There was an interesting thread in the Multi Engine Forum on a TwinAir build with dual vertical stabs. I thought I had it bookmarked, but can't locate it now.