Dude, that's a solid setup. I just use a mason jar with the ring screwed on loose, works fine for me.

Planning is just guessing anyway.

Actually, a bench-top jig for crosscuts on long sheet goods is still pretty sketchy. The real issue is the weight and balance, not just the cut. Even with a good jig, you're fighting to keep a 4x8 sheet from tipping the whole setup. A couple of roller stands are a safer, cheap fix for that specific problem.