I came across this method of skidding a circular saw a few years back and have used a 50” and a 98” jig since then for knocking down sheet stock without too much trouble.
One day I was faced with a nasty cut on an angle that had to be relatively accurate and I decided to use this slider again.
As you can see I set the board in place with C clamps and just push the saw along the straight edge and on the masonite backing. ( the c clamps are modified with round wood handles making them easier to set.
It’s the easiest solution I have found.
I know you can buy the aluminum rails for this but they dont support your saw on a smooth surface the way this does.
ps. You can lay out a 2” sheet of styrofoam on your saw table top to cut against so the blade will clear the table . A $10.00 sheet will last a long time
-- A mind, like a home, is furnished by its owner