Thanks Mike...
Ron, Leave it to wisdom to throw a wrench in..

I had not really considered that being an isolated line and could possibly build up high pressure, but it definitely could. I will put a small 1/4" relief valve in.
Here is the sink with the erm.. faucets installed. Going for the utilitarian look. Those should last a while. That's a short brass garden hose sprayer on there, should work fine as a diffuser.
Next - what I did today. These are a set of jumpseats. Actually jumpseat/cookstove flat/ benches that fold up out of the way. One on each side of the back wall of the cabin. On 10-12 hour trips, standing gets a little old. Notice too, the curtains are in. They are really just canvas flaps that roll up and down and tie each way. One on the portholes too. I'm sleeping on the tug at the show and some people show up very early. Speaking of the show, two more days until Mid Michigan meet at Hastings Mi.
-Ron