Weldments weekends!

These parts are modeled to brush up on SolidWorks weldments features. Engineering POV: Weldments are essential in building sturdy structures. Type of beam used, angle of arrangement, proper trimming of the beams at junction points so they are welding easy, putting correct weld bead markups, gussets, are key players in deciding the mechanical performance. I - beams is the most successful design thus far. Can you tell why??