I am a big dude ( close to your dimensions) and I fit fine. My last ride was a Ford Excursion so I had to make adjustments to how I enter/exit the vehicle, but once I am situated Everything is fine.
I use the Husky Waterproof Tubs from Home Depot , they come in several sizes that you can configure as needed. It's also easier to remove the smaller boxes if you need more room in the bed. They stack together and fit under my tonneau pretty well...
Just a couple of questions
1) Do the clamps interfere with the factory tie down rail?
2) Can it be opened partially with just 1 or two panels folded?
Thanks in advance
John