Doc,
To tighten up the steering on the motorguide is pretty easy. All you need to do is take the head of the tm apart. Then remove the steering rack assembly, its held down by 6 screws. Then loosten the set screw in the pinion gear and tighten that pinion gear a little to tighten up the steering, then retighten the set screw and reassemble and your all set. Just dont forget to realign the arrow. you may need to try it a few times to get the feel you want but its easy enough to do. Also dont tighten it too much because it can cause steering cable issues if its too tight.
Brad,
When I put my minnkota on my nx882 I glued two pieces of 1/2 inch plywood together and then cut them to fit the hole in the floor. I carpeted it and screwed it down in the recess. It works great and looks factory.
I have reservations about modifying the pedal on a minnkota to make it fit in the recess. All the electronics are in the pedal and it needs a lot of air flow to keep them from cooking. My tm repair guy told me they now want people to leave the rubber feet on the minnkota even if your screwing it to the deck. They say this will help airflow under the pedal to prevent overheating.