To set mine I gust drop the raised side of my 45deg square into the cut line of the base then move the fence in and lock it down.
I still have some finishing cuts to make on the angled fence pieces before finishing. As yet I also have to attach a piece of lexan to give it safety.

CHRIS, Charlottetown PEI Canada. Anytime you can repurpose, reuse, or recycle, everyone wins!