My rocker table is gender neutral, but essentially we are in agreement.
You could get good results forming the channels on a rocker table (or even on a flat surface), just secure the core to the surface and use some tiny devils to prop the parts up how you want them.
The tips (and the fillets of goo) must be thin enough to preserve the flex you are after, keep in mind adding "corrugations" and glue affects stiffness.
Doing it on the rocker table helps make sure you will still hit the rocker you want.
By the way the glassing is ...interesting.
A vac setup would help, and/or you can use spray adhesive (3m no. 77) to tack the glass to the channels.
I am giving it up, I hope the grumpy shaper's guild doesn't disappear me.