Hi, so I'm currently trying to build a cubic bedframe out of metal pipes. The frame would essentially be a 7'x7'x5' rectangular prism (HxWxL, I.E. 7x5 being the base of it), with four 1' legs holding it up. However, I would like the top of the frame (The 7x5 square above the bed) to be able to support some weight, ideally like 250 lbs at any given point on the horizontal bars. I was also considering using some tees to add additional vertical bars along the 5x7 vertial walls of the bedframe to give additional support, but I'm not sure how much difference that would actually make. I was planning on using the schedule 40 steel piping you can buy at Lowes/Homedepot, but the largest sizes were 3/4" and 1", and I wasn't sure if either of those would be strong enough to support this. I have a bit of a math/engineering background, unfortunately it's all in software and computer engineering, not mechanical or structural engineering. I could not find anywhere online to help with even rough estimates of yield strengths of horizontal steel bars, nor equations I would need to figure it out myself, so I really have no idea how to calculate this. I'm not even sure if I should be worried about the horizontal bars, but instead should be focused on the support beams buckling.