ask & ye shall recieve
the backing plate is a 1/2 piece of ply that is epoxied & glassed on both sides. i wanted to put a piece of sheet al, but didn't have one at the time. the black tube (4" plastic drain tile) on the left is where the line goes down to the anchor locker. i lost the cap to the deck pipe and this funnels the water to the anchor locker and on to the bilge. one tip, get the biggest deck pipe you can, makes putting the line in easier.
this is a side shot.