Torque box question

I welded in sub frame connectors years ago, car was level and on jacks. Of course, THEN I bought a rotisserie lol. Once this car is disassembled again it'll go back on the twirler for mods at the spare tire well for new valance exit exhaust route. I will be installing torque boxes too. Common sense tells me not to do the torque boxes on the rotisserie. but with frame connectors in, I'm thinking deflection would be at a minimum? Does anyone have any stiffening data or specs on post frame connector chassis? Sure would be nice to weld upright if possible.
Thanks,
Tim