It's quite light, as mentioned this is 1/16" wall thickness aluminum. So far I can reach out and lift the frame with my arm outstretched without even straining myself.
The acrylic corner brackets were not my first choice, if you read above. I'm still waiting for a machine shop to fabricate me some metal ones. However, it is hi quality 1/4" acrylic--properly bonded (I use IPS weld #3), its pretty strong.
I'll comment on the overall strength of the case. As seen in the last picture, its has pretty good stability. When bracketed together in a full structure, it maintains its integrity quite well. Certainly strong enough for computer components, but probably not strong enough to support human weight.
It is a very large case. There is some torsional wobbling if you work the long axis corners. I do have plans to stiffen the case up. The framework to mount components and panels is going to double as cross bars to add stability. Finally, when you lock the panel pieces into place, it should be quite rigid. Unfortunately a little bit of wobble is inherent in such a large frame with big wide open panel sides.
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