I have a boat and know a bit about sound systems for them...lots of options, but don't think you will find many marine stereos which have the big square footprint that new stereos have....most are the older smaller form factor (i.e. rectangular).
Probably could find a faceplate to adapt it in.
One way you could go is to mount the head unit in the console, or in a box or ?? and use a remote waterproof head....this is what i did on my boat...the stereo unit is inside the cabin, and there is remote control unit (which mounts into a standard [boat] gauge hole) on the dashboard. it controls the stereo and an ipod if one is plugged into the unit below.
There are others which have a gasketed cover which may be another option.
If cost is not a factor, the boating community had high regard for PolyPlanar..they have been making marine stereos for decades...very good stuff for a harsh environment.
Check out www.rocktheboataudio.com
that is where I got my Jensen MSR 3007.