Previously, I was working on getting a block of wood to the curved shape of the cabin top. I cut away much of the material that I didn't need. I tried sanding it but the paper was loose so it didn't work out well so I got another sheet of 60 grit and taped it down to keep it from moving. This worked out well and took quite a bit of material off that smoothed it out.
Today was a very busy and productive day. I got a lot more done than I thought I would. I originally thought I would only be able to install the vent on the cabin top. It was a bit nerve racking since I was about to drill a new hole in the boat. To get an idea of placement, I placed the fan housing from the Airhead toilet on the ceiling to see how much bend there was in the hose.
I used a 5/16 bit to drill out the four corners to mount the wood block, but not all the way through. This allowed the #8 screws I got to be countersunk below the surface. I used a smaller bit to drill through the rest of it, then the pilot holes into the cabin top.
I taped around where the block was being mounted. I also used tape around the block. I used Dolfinite bedding compound to bed the block onto the deck. Dolfinite has been recommended by other Nor'sea owners numerous times so I thought I would give it a try this time. A dock neighbor suggested I use 5200 or 4200 and said he never heard of Dolfinite. I wasn't about to go buy another type of sealant.
After using the Dolfinite, I smoothed it out on the edges and removed the tape. I wonder if I should have waited for it to setup before removing the tape but it seemed to work out well. I then used a 3 inch hole saw to cut out the center of the block. Turns out the cabin top is about 1 1/2" thick.
I mixed up some epoxy. I used it to coat the interior of the cutout of the deck only, not the wood block. I only used it for a single coating.
The vent I got is a Vetus Mushroom vent. I took the base and drilled pilot holes for the screws I got at the nearby shop.
I also used Dolfinite on this too. I put some of it in a ziplock bag and cut the corner out of it to spread it out a little at a time without putting too much on. After placing the vent base back on, I decided to leave the tape in place this time. I also put the top piece of the vent in place and the knob that is installed from underneath.
I put the fan housing over the hole that was drilled out. The surface was flat enough, I didn't need to put anything else over the hole to mount the housing. I also ran the vent hose like the second picture at the top and it reached where it needed to on the head.
I mounted the head and the liquid tank onto the base. There wasn't much clearance for the mixing handle so I may cut that short for it to do complete turns.
There's only a few other things that need to be done to complete the install. I need to connect the wires for the fan that's mounted in the housing, install plugs on the wood block to seal the screw heads, connect the vent hose to the head and then it's pretty much ready to use.