I had an open wall and a sheet of cheap 3/4inch plywood sitting around so I made a French cleat wall.
If you are not familiar with the system, the slats on the wall have the top edge cut at a 45 degree angle and the shelving/storage items have an opposite angle so they slide right into the grooves.
More pics of my messy shop
Did you use a table saw for the 45s?
Yes, I used my table saw.
However with a diy circular saw sled you could do this without too much fuss. Most circular saws I have seen allow the plate to be adjusted so the blade sits at an angle so that shouldnt be a problem.
I have broken down plywood into strips in similar fashion using that method.
Simple version https://www.wwgoa.com/article/shop-made-circular-saw-guide-cheap-easy-and-awesome/
If you have access to a router you can make a version that keeps you from straying https://www.woodmagazine.com/saws/shop-made-circ-saw-guide-cant-stray
When I cut down sheet goods with a circular saw I have a big 4x8 piece of foam insulation I lay on the ground and then set the plywood on to keep things well supported and keep the blade from hitting the ground.
Back when I did it, it was even simpler. I used t the circular saw guide attachment here. Set it to a certain distance away and the circular saw inclined at 45 degrees.
Yep that would work too!