The unconventional design with taller than wider tub is to reduce the air lift created by the hull. This rigger is not supposed to be too maneuverable, I can increase distance between sponsons for stability.
Regarding T-tail I was thinking to test if at higher speed the T-stab will lift the rear shoe out of water and run only on front sponsons. Anyway if not efficient or troublesome can be removed.
The CG is about 70-80mm obove water while gliding.