Got the seat mount/floor brace bridging completed. Because I had an extra set of 1/2 height body bushings left over from cutting those mentioned previously, I decided it wouldn't hurt to provide some extra support to this brace. I didn't want to just put a bolt through the center of the bushings because that defeats the purpose that the bushings are designed for; vibration isolation. Since it was such a tight fit to get those bushings between the 1/4" plate and the frame I chose to simply lather the area with POR-15 and slide them in with the floor brace jacked up slightly. Let the jack down with them in place and after the POR-15 dries those things are not going anywhere. The floor feels as solid as stock and should even be stronger due to the added support of the frame.
