I plan on removing the rear seats, then cutting the entire floor out from where they were. Probably from where the rear passengers' feet would be all the way to where it humps up over the rear axle (about where the seat back is for the rear seats). Then I'll box the whole area in with tubing.

That being said... this is a unibody. I don't want it to bend in half or anything when I do this. I do have SFCs so I am not really too worried about it bending front-to-rear, but what about side-to-side?

At the moment I'm inclined to run the front wheels up on ramps, and support the rear axle on jack stands... leaving the axle attached by the LCAS and springs/shocks. The torque arm and drive shaft will have to come out, they'll be in the way. Any other suggestions?