I have a few suggestions.
One would be to add some metal to the footing plates in a vertical plane on the rockers. This ties the footings into the car better then just to the floor which is just thin sheet metal.
Also since you have already tack welded the footings to the floor you can drill holes in the front ones using a hole saw to allow the front down tubes to drop down through them. This makes is easier to do a full 360 degree weld on the tube to halo bar junction. You can then just add a plate over the hole and weld that in and than the down tube to it.
And was mentioned raise the point of the rear braces a couple of inches so all the tubes intersect at the same point.
Last I would extend the harness bar all the way across the car to the right side main tube and then tie the tube to the "B" pillars with some flat plate.
Otherwise it looks good.