Full tube chassis

i'm looking at a 2x3 chassis car. the pictures of it look like they cut the floor and fire wall out and set the car on top. and welded it to the rocker pannels. It has alum. floor and firewall now with a steel (scatter shield) bolted to the frame over the torq converter. I do know i will have to wear a fire suit. It's like a back half chassis but it starts at the uniframe back. i will try to get some pic o"ya ladder bar/coil over on the rear.