Bob, I bought a Jett 120L and I want to install it on a OMP Fusion 67. The tank that came with the ARF is on the small side and I bought a Sullivan BT-16 which is a boat tank.
It's narrow, only about an 1 3/4" thickness by 3 3/4 x 5 3/4. It will fit the profile perfect and not hang out in the wind like a square tank.
I thought about using uniflow to eliminate the head pressure as the stopper is dead center.
Have you guys fooled around with Jett's and Uniflow tanks? The plane will probably be inverted as often as it is right side up. As well as every other vector.