I built this last weekend and had a blast with it. The design was from Ana's Factory Cart Coffee table, but I built it a little bit different. The side boards are from 1x8 pine instead of 1x6. I wanted it to be a little bit taller. I ended up getting the casters from Home Depot. They were $25 each. However I saved some cash on the top by using wood from a pallet that I sanded down and stained. The overall cost was about $120 with $100 of that being just the casters.
I did the No.52 and max weight by creating a stencil and painting it with black paint and sanding it down.