I recently purchased doors from Bomon.
They are not fully waterproof, but very close. The quality is exceptional.
There is room on the front edge of the slider for a drip edge they did no include. I plan to make one from clear acrylic. Room meaning clearance as the drip edge will slide over the hinge door.
The leading edge also needs a seal at the corners of the forward labyrinth. Since that location is in the margin between the labyrinth and the sliding track; it will be tricky. A tiny rubber sweep may work. That is on the edge of a well designed wave breaker. A waterproof option might be another wider sweep atop the lead edge, but the aesthetics would suck and a breaking wave might bend or break it in horrible seas.
These were $1600 per side for cat hulls for both the slider and hinge door.
About my only complaint is I told him my opens were 18" wide and he built to 18" and a hair. In home construction, a rough open is sized larger than the doorway for insulation/install clearances. I am lucky as it appears to not be a problem for the moment, but I did need to open up the opens about 1:16" each side.
To not end on a sour note, I am buying more stuff from them for the cabin and I highly recommend them. Great guys...a little surly, but only because they understand the business better than me.
