Nice work !! I used 2x3 and coped them to fit the floor,I didn't want to cut the rear pans, i welded some pipe through the drivers side for the ebrake cable, It worked well for my car.
Are those turned so the 2" side is the top and bottom?
I think if the 3" side forms the top and bottom it slides over the rear frame better. Plus, less to cut out if you want to keep if from hitting the floor.