Tony, your build just keeps getting better!
Just thought I might add a couple of notes of caution:
#1 Make sure you follow the rule book on under floor reinforcement as the cage is no better than the under seat tubing in a tumble.
#2 If you are building a tub, remember that we don't have all the safety equipment that Indy cars, etc. have to cut you out of a burning car.
Make sure that a jaws of life or a sawsall has access to the tub (holes for access).
Personally, I think arm and leg restraints, door nets, and roll cages beyond what the rules call out are a better way to go on the salt.
Although we have had some catostrophic accidents in the past, keep in mind that we will never hit a concrete barrier, light pole, safety cable, or another vehicle.
I would prefer to take my chances on impact with the emphases on getting my body out of the car quickly, especially if the car is on fire...................... Bob