Frame rail replacement help

View attachment 1715467566 View attachment 1715467567 View attachment 1715467568
View attachment 1715467569

Basically it’s some old scaffolding....added some tubing under the rockers and cross bracing from left to right. Once the scaffold was squared up and levelled we bolted it to the floor. Squared car on the jig and welded it on. Pretty stiff.
Thank you for posting those pics! Gives me some ideas. I agree that @Oldmanmopar would have some good input here.