What size pipe are most of these things made of? Wondering if I can use whats on hand or if I need to go buy something thicker than standard 1.5 and 1.75 roll cage tubing. Have a bunch of leftover 1.5X.095, and some 1.75X.095. There is some random pieces of .120, but probably not enough without going to buy another stick. Anybody have a commercially built one they can measure up for me.