I was thinking about the direction of loading on the lower frame layer and started to wonder why square tubing wasn't used here more often. It seems like it would be stronger and more appropriate given the load directions. I see some TT's being built that the lower frame layer are basically boxed structures. Obviously a roll cage needs to be round with the multi directional loading but it seems as a lower frame layer could benefit from the use of a square structure. Kinda like a boxed vs. round suspension arm. Single direction loading makes the box structure more preferable. I would imagine tube direction changes would not be made with bends but cut angles. Cut the appropriate angles, cap the ends and weld them together and gusset accordingly. Just curious what others though about this...