Subframe connectors and stiffeningkit dxf_files ????

It uses the floor horizontal as a sheer plane. It's a decent way to involve a much large structure. It's a bunch of work and a PIA to do it.

I tend use 2x2 or 2x3 tube that is .080-.120 thick. Worked well for years and if you are putting in a bar/cage, tie a bar into the connector or make an outrigger to the rocker to land the main hoop.
Too bad there isn’t really a good way to test it.

I know one of the Mopar magazines about 10-12 years ago did a test where they took a third gen Charger and welded in some generic DIY subframe connectors, tested it on a skid pad and Auto-x, and then Cut those out and welded the US car tools ones on. I done recall the specifics and I’ll have to try and dig thru the magazine stack to find it, but the results were marginally different at best.