I want to put a floor in my alumacraft MV 1448 between the benches. I plan to use regular plywood and marine carpet. I want it to be somewhat removable so I will only adhere with several screws into the ribs underneath. Also, the boat is kept under cover and does not get wet. A couple of questions. What kind of screws should I use, and any tips on drilling pilot holes? Drillbit type etc? Also, should I use 1/2" or 3/4" plywood? Thanks for any and all help.