But I'm astounded that the steel bits are fastened exactly the same as the Anet Acrylic frames Wee screws and captive nuts.. Seriously !?
Metal has Far more advanced/sophisticated fastening technology than that.
One could readily cobble up a more rigid structure using decent quality 3/4" Baltic Birch plywood
That at least can be screwed and glued together Very solidly... possibly even by Computer nerds. Just a thought