To organize a bunch of plywood scraps, lumber scraps, and sheets of plywood, I started working on a design that limited wall space, was mobile, and was cheap and fairly easy to throw together. I saw a lot of different carts but almost all of them took a full sheet horizontal which took up a lot of space. A lot of the carts I saw seemed pretty heavy and made from a number of sheets of plywood. I didn't want to spend more money on sheets of plywood then absolutely necessary ( rather use the sheets on projects ).
After the research, I threw together a Sketchup model which was a great starting point. And it was the first model using the new Space Navigator.
The result varied a bit due to the scraps I found stashed in the garage and what fit the best. The overall dimensions are the same though.
Picture of the glue up of one of the lap joints for the top frame.
Here the cart is coming together well. The casters are on and it rolls around very well. I used the same casters as the tablesaw mobile base and they handle the weight easily. They also lock both the wheel and turning. Link to Casters on Amazon
And the finished product with a little wood on it already. I have to be careful where it gets rolled or a full 8' sheet will hit low hanging things in the garage ( Door opener, Bikes, etc ).
Happy to answer any questions about it and share the Sketchup file if anyone is interested.