Roll cage

[MCMLXIX]

I am working on a street car. I boxed my frame and added in some additional bracing. I don't want a cage in the car as it will be a daily driver. I do, however, want some more triangulation so it doesn't flex as much. I had two ideas.

1. Add a bar that runs along the bottom of the dash from side to side and tie it into the lower A-pillar. The plan was to weld on a plate to distribute the load. Then drill the plate and insert the bar so it actually sits inside the factory sheet metal, then weld in place. I would use this to hang the IDIDIT column and Wilwood pedals from AND - Run some down bars through the firewall and to the front frame horns. This would give me a 3D structure to eliminate front frame flex without actually intruding into the passenger compartment.
* Will this work? * Is it worth the effort? * Will it help or hurt if there was an accident?

2. A removable harness bar. Not sure how yet.
~~ One idea was to have some 3/8" thick tabs welded to the floor and near the wheel wells. That would give two mounting points per side for a triangle shape with one corner being at the back of the seat. Then run a bar from one side to the other. That would be the harness bar.
~~ Another idea was similar to the dash bar. Plate the area below the 1/4 window where the back of the seat would be. Then just tie both sides together and that would be the harness bar. Not sure how to attatch it. I've seen some roll cages with a swing out side bar with a spring loaded lock or back to the tab idea.