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I've read before that it is advised to install frame connectors with the car either on a 4 post-drive on type lift or on jackstands with the weight of the car bearing on its tires.
I have also seen bare shells on rotisseries with frame connectors being added.
Soon I am going to begin work on a 65 Valiant Convertible. The owner wants some handling improvements including chassis stiffening. It currently is a roller with no engine/trans or interior in it.
I'm curious of any troubles I might encounter by doing the chassis stiffening while elevated on a 2 post lift. I'd think the lack of engine and trans would reduce flex with the car in the air as compared to a complete car. My thinking is that if the door gaps are consistant with the car in the air, it should be safe to install the connectors.
I plan to use 3x3 .120 wall tubing cut and boxed to sit against the floor, similar to those that I made for my brother in laws 72 Duster.



IMO like you suggested. I think if your door gaps are good on the lift and good after the welding, then your good.

Like you said the motor and trans is out minimizing any flex to begin with, I would do it just as long as the car don't flex when you lift it off the ground, watch it closely as you begin the lift.

I did mine with the bare shell(coupe) sideways on my rotisserie and that was really easy. Everything fit on the car perfect when it went back together.