About this compression post thing.
I think the post should be designed as a single (welded) piece that is bolted thru well fitted flanges to the beam and the floor. There should be no way that it could come apart.
There could a scenario where the boat is thrown on its side and the compression post be popped out of its seats. Pipe over flat washers as in the example previously. Possible. Could think that the compression post is holding the cabin up as well as holding it together.
Maybe this is a simpler solution: If the overhead beam is wide enough for an actual pipe flange (so named) which is a common pipe threaded fitting usually with chamfered holes for screws already drilled, one of those at each end of the pipe to widen the point load and hold it in place. They come threaded for pipe or unthreaded like tube fittings. Various collar heights and amount of thread. You use the cheap threaded ones, using that bottle jack to positively hold open the distance between beam and floor, the pipe would be micro fitted by tightening or loosening the flanges. Then welded to set the length of the post and close the seams and lock-in the flanges. Making it a single piece. Then galvanized, have to zinc the threads and fill the crevises.
Have to decided for yerself if the screws you put thru the flanges into wood are enough. The post is going to get yanked on, screws in sheer, so it's probably good. imco
This structure is simple - allowing positive fastening - and easy removal.
Careful cranking on that jack. Don't want to distort anything. It's an extra hand.
Reply With Quote