Side Toolbox for GFC

We’re planning on getting a GFC Camper when we order a new F-150 in the spring. Is anybody building or has anybody fabricated something similar to SnugTop’s side tool boxes? Just for reference, here’s the page with a few photos of what I am thinking → Tool Boxes for SnugPro - Options | SNUGTOP.

Thanks in advance for any ideas!

GFC just announced something like this they are building