If it helps with design thoughts, I have one on my Ribtec, created/installed by Ribtec from new, which I find works really well, and combined with a fairly high windscreen actually provides pretty good protection in nasty weather! As well as some sun protection, although that's probably the less frequent calling here...
Any good stainless guy will be able to build one, once you have some firm ideas of what you want, how/where you want to mount it, etc. Similar to above, mine is mounted to the original Ribtec console rather than the deck.
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