I suppose this one is about due for an update. I've been working on it, but thought I'd get it pretty much done before posting though.
None of the local hobby shops had enough tube sizes to go from big enough to small enough so I kinda winged it and built a real "wet box" inside the hull. This way the exit hole is plenty tall enough and not overly wide like it would have been with a tube anyways.
Now I have to let it finish curing so I can go test it for leaks in the tub.