I would thought that could you use a vacuum table to get all the air bubbles out, that's the way I did it years ago building parts. I know that's how they build surf boards and other structural parts without air bubbles. Most Epoxy cure rate is given at 70 Degrees and every 10 degree temp cuts...
Just build the cabinet a little higher so you can roll it up to the post, you could ever notch it. It would be a shame to shorten it. I have a early power attic and a old Walker Turner from a WWII defense plant.