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Yes, I made reverse plates for under, and I used some more 1/8 steel to tie it into the cross brace under the bed.
For now I did the sandwich thing for the beginning of an 8.50 cert per NHRA spec for a unibody car, 6x6 1/8" steel plates top and bottom with four 3/8" bolts. I am only building the rear half currently, not making A pillar bars and/or a front halo yet. When I build the new chassis I plan to tie the cage into that chassis, which is why I didn't just weld the plates to the floor I haven't decided if I will just go solid body bushings or try to add poly bushings to the cage tie ins. IMO the cage tie ins and body mounts need to match and I am not ready for that quite yet. The tubing is 1 5/8" x .083 wall 4130 chromemoly which is what I used in my Regal per NHRA spec. This is not going to fully adhere to any NHRA or SCORE rule book, this is going to be a compromise for useability and access. Plus its basically a 4WD dune buggy that I will also do short 300 ft sand and dirt drags, I'm not going to be going 120 MPH like a trophy truck or over 150 MPH like my Regal, nor am I a rock crawler that might fall considerably and land upside down on granite.
This was just a mockup before I rounded the corners a little and it will come apart for paint once the double roll bar is done.
