AT that stage where I want to put a finishinbg edge on my layout and have seen a variety of things done.
Most seem to use a fibereboard panelling cut in lengths but I am open to any ideas and sources [I am located in Canada so Home Depot and Home Hardware are my best sources here].
I also want to add some plexiglas safety rails along the front edge strategically for “small hands”…
Something to be careful with is the ‘edge’ of whatever sheet material you use. You can use a router (or router table) to cut a curved edge, and there are hand tools for acrylic work that will cut and if necessary polish a plastic edge.
I’d use Lexan polycarbonate rather than Plexiglas or acrylic plastic to keep little meddlers at bay. Be careful when you clean it; it scratches surprisingly easily.