I started building the first carbon cross frame. It uses custom ENVE tubing, ENVE seat and chain stays (for cantilever brakes).
Here are the main triangle tubes mitered in the jig. I carefully mark them before cutting to avoid any screw ups.
I cut the molded end with threaded insert off the stay and tried the Crumpton seat stay plug. Still over 1/2" short given the amount I had to remove to eliminate the molded end.