So I went to the DIH Workshop held at my local Home Depot and finished my cart over the weekend. I had the guy at HD cut my plywood down, won't make that mistake again. He made each one about a inch shorter than I asked for so I had to make my adjustments for everything else based on that. Next time I will take a tape measure with me to make sure instead of lugging everything to my car, taking it home and then measuring.
All-in-all I like the way it came out even with the minor adjustments still a fantastic cart.