Just buy a used rack.
I’m not saying you can’t make a semi-decent rack out of dimensional lumber, but I would not trust that one.
“The main frame is made of 2x6’s, which I have WOOD GLUED together.”
The major problem is in the bracketry holding it together. That stuff will not hold if it’s bolted to the floor and you come crashing back in the rack. It would probably be an ok temp rack for a beginner, but I would be afraid to squat any serious weight in it. Confidence in your equipment is a big factor when it comes to lifting heavy weight.
I wouldn’t want a rack made of strut bar or angle iron either. Strut bar is not designed to be weight bearing. 1/8" angle iron is not the strongest stuff either. Don’t believe me? Grap yourself a 4 foot chunk like the one in the picture, put one end in a vice, and see how much force it takes to bend it. The same can be done with the strut bar.
If you want to build one, you need to build the whole think out of 2x2x11gauge steel tubing, at a minimum. You need quality welds and gussets at each junction point. A quality finish must be used to prevent rust. With the current cost of steel, you will find that buying a used rack is much cheaper than building one, even if you can do all the work yourself.