I'm building a 6'x12' steel platform that will be 3' elevated from the ground. How can I determine what load bearing weight will be if I use 2" Square Tubing, 1/4" wall thickness and then use 1/4" angle iron for the platform structure? I was going to use 2" Sq tube, 3/8" thick, but most local suppliers in my area only stock 1/4" thickness. There will be approx. 500 lbs of equipment on the platform (stationary) and from time to time 3 adult workers, so I figure approx 1,500 total weight (maximum). I need to know if 1/4" supports will hold this platform up. Thanks for your help and direction. I have an attachment that shows the basic platform that I will be welding.