If you have a regular need to cut down sheets of plywood, you're undoubtedly already thinking of how great it would be to have your own panel saw. You're right, of course, and here are a few examples to nudge you in the proper direction:

Vertical panel saw by Alexander Birnie


Homemade Panel Saw From Pipes And Castors by WayOutWest Blowinblog


Homemade panel saw with clamps storage by BiggeDink


Homemade Vertical Panel Saw by Radim04


homemade panel saw by joe henry