Don,
I too have support behind the dash of my '31. I can't find a decent picture but it is welded/bolted in place and will clear my gauges and a/c fairly well even with the double engine recess. This is a picture BEFORE the wiring was straightened out. I also did reinforcements from the rear door post to the back of the car. Then I reinforced the floor with square stock and a double up of the sheet metal as well. Again, no decent pictures - I did lose a bunch when I had a computer crash. With as much reinforcing, I can pick up the body without the doors and have virtually no bending or deflection vs a 'normal' 30-'31 Model A.