Once I finished the drains under the cabin, I went topside to make sure the drain vents were all going to tie in together and vent out the side and under the eve. I tied them all together over the wall that divides the bathroom from the rest of the cabin.
The drains and vent pipe under the counter did not go inside the wall until it tied into the vent going up the wall. The reasoning for this is that I was running out of room in the wall and it will be hidden under the counter top. The hot water tank is going to go in the corner. The hot water tank dimensions are 26 inches tall (including the 2 inch Styrofoam base) with a 22 inch diameter. The kitchen sink vent will clear the top of the hot water tank by 4 inches.
I put in 9 hours today (190 total hours to date.)