Thanks @Adam and @lo_0l ! I want it to look like a simple, low-profile bed frame with a 3" brim in the head and the foot, 78" long, 55" wide, 3" high off ground. I am also flexible on not having a brim at all. I was thinking of using velcro on the square tubing to attach the wood planks on top.
I was thinking of the 78" square tubing. I am uncertain about which connectors to use and would greatly appreciate any suggestions 🙂
https://www.rockwestcomposites.com/tubing/shaped-tubing/square-tubing