Compact geometry equals a really small/stiff rear triangle. Ride quality is still ok because the seatpost is relatively long. The plan set out in the OP is the opposite and would result in a really short seatpost, and maybe a pretty crap ride, with none of the aerodynamic benefits that lo-pros are all about.
I think the frame builder may have refused to build it because they can't see a good reason to.
I can see where the frame builder is coming from.
Compact geometry equals a really small/stiff rear triangle. Ride quality is still ok because the seatpost is relatively long. The plan set out in the OP is the opposite and would result in a really short seatpost, and maybe a pretty crap ride, with none of the aerodynamic benefits that lo-pros are all about.
I think the frame builder may have refused to build it because they can't see a good reason to.
It'll look good though!