I found that most marine electronic devices that are "made for the sea" are not at all different from devices not made for the sea, except may be the outer box is slightly more waterproof (and a few go as far as pouring epoxy
over the back or front of the assembly). Most don't even bother to use tinned wires or stainless fittings.
So, I wouldn't worry about "marinization" too much. Whatever you do, would be no worse than anything that comes out of Blue Seas or Uniden (which is all chinese junk anyway, no offense to great power of the east)