Probably easier to buy some cheap dollies from harbor freight or home depot/lowes. but if you need a custom size then maybe building one would be better. Thx for watching
If the plywood is thick enough, you could just attach them straight to that. Or add a couple 2x4's to the plywood to attach the casters to. Sorry for the late response!
No problem. Casters with brakes would definitely be the safer option. All I had at the time were without brakes. I just put something heavy behind the saw to stop it from moving like sandbags etc. Thanks for watching!