"Because Henry Shires has said time and time again that he will not be providing cuben version of his shelters."
I think you missed the "wish list" part of this thread....
Cuben would be nice, if for nothing else it would give everyone (whether you have the cash or not) a good idea of how it would stack up in a TT design. I understand early on Henry staying away from cuben, but his business seems developed enough to offer it now.
Not sure how compatible the two components are, but I once dreamed of a cuben on the spine, with sylnylon panels so that it wouldn't stretch as much but with a syl nylon cost.
The other thought I had was some vents on the roofline. I still see complaints of condensation in TT designs. My cheap Kelty tent has a vent in the roof that you can velcro open or closed... very nice.