Re: Homemade navigation housing
GOB had a recent article on someone addressing this same issue.
Starboard material is actually quite decent to work with, it machines easily (router) and finishes up quite nicely. IIRC MaineSail made his own instrument platform around the binnacle with it, I've built a cockpit table that worked out quite nicely and it seems to be standing up to UV so far. It takes a screw pretty well too, but be sure to use an adequate pilot hole.
Based on our table experiment, I'd cut it with a router and an edge guide rather than a table saw.. you'll get a much cleaner edge that way.
The only knock on it is that it's rather heavy.. But with care you could certainly create a nice box with radiused edges/corners that might look just fine once done. Attaching it to the binnacle rail will be another challenge...
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)