Hey Marc !!! Dad did a Great Job my Friend !!! I keep Orange Spray paint on the E350 , I paint on Sub-floor at every Vent :Caution do Not Cover Vent Holes with a Big Orange Arrow , I Screw Down a Piece of Plywood over hole for Safety and where they have to Physically remove, then take a Pic !!! If the Dumb Ass covers they will be in the Crawl, Not Me doin the Pilot holes to get there Cuts !!! The Home Owner can call them Back Out to Cut or Pay me a $500 Add On !!! They always come back out !!!