Waste board replacement

on inventables web site i seen a quick shoot of some one having an aluminum “T” slot on there table any one care to share this info , that’s what I’m trying to find i have check with industrial supply location near and far no If I could locate the corrects size I will mill it for T .
I would like to get this machine going.

Thanks Kent

Check out PawPaws videos he tape/glued strips of MDF on top his waste board and created his own. I believed he used toilet anchor bolts to slide in his grooves to anchor his material with. Personally 99% of what I do I use the tape and glue method