When I build my cage I want to be able to remove it for painting of the tub and the roll cage. So instead of putting a hole in the dash and running the tube through it then welding on the floor plates and not be able to remove the cage, I'm going to try and "groove" the dash and then weld a piece of tube that is larger than the 1 3/4" roll cage tubing in the groove. Also I did not want all of the bends in the cage tube that have to be in the tube to be bent around the dash. This will be much stronger because the tube will come straight up from the floor and then only have one bend where it exits the dash to follow the windshield frame angle.

As you can see the holesaw didn't work so well on this side because the pilot drill had nothing to drill into, the drivers side worked better with the holesaw because the pilot drill was able to drill into the dash.