List Your Mods:

The product (see below) comes with the instructions on how to recess the dispenser. It's pretty simple, you just need to make sure you've got a wall with the space available. 

I started by determining I only had two wall options in the 178, behind the toilet and in front of the toilet. Both the left and right walls didn't have the space available. I determined it would be too difficult to turn around, while seated, to get to the dispenser so it had to go in the wall in front. 

I removed the panel on the outside of shower that lets you access the back of the shower/faucet and using a flashlight figured out what would be in the way and from there determined my favorite location. Once I knew my spot then I just followed the rest of the directions to cut and install the dispenser. 

We've really like it. We just shut it to take a shower and the TP stays dry, but we don't have the old problem of being without TP after sitting down when you realized the person who took a shower had to remove the roll. 

http://www.go2marine.com/product/91576F/oceanair-dryroll-watertight-toilet-paper-roll-dispenser.html

What did you use to attach the shelves to the walls?  Very nice work!!

Thanks, 

Podgirl