The box will certainly survive the humidity for a season. What worries me is 52#/$1800 woofer held to 1" MDF with wood screws.  

In Michigan, you do great to get 100 hours a summer (non-lakefront). I get 50 hrs/year but we have 3 boats in our group. 

Mine currently has JB Weld on the side of the block. Wouldn't know it was there if you didn't look. Planning on running it like this as long as it will let me.

Did you try ski-dim?

Also try Marine Hardware.

13 hours ago, Jordan22 said:

Giving this thread one more bump before I proceed to trim this fresh air exhaust. Can anyone think of a possible concern if I were to just hack an inch off? It should still be about a foot below the waterline which is all that matters, right?

Here is a pic where you can see the wedge isn't able to pass underneath...

I don't know... You might give FAE a call first before you grind. That seems like it's the wrong piece or something isn't installed correctly looking at the amount you'll need to remove from the photo. Mine is 5 inches from below the bottom of the boat to the tip, to give you an idea. They have really good customer service. If I were to grind, I would do it on the other side of the pipe though. That finished end is shaped like that for a reason I reckon.