My comments on this, based on running a similar system:
1. Don't try to combine nav computer functions with entertainment. I have a 23" 4K monitor for nav functions and a 32" Samsung TV for entertainment. I do put nav functions on the TV (either
OpenCPN or mirror the plotter screen) for viewability away from the nav table, but never the other way around. YMMV.
2. That being said, in my opinion 17" is too small for this. If you're using it for
route planning, especially if you have raster
charts, then you will really want it to be at least 21" I think and full HD at a very minimum (and I highly recommend 4K if the program and computer support it).
3. You will find it extremely useful to have nav computer monitor and Furuno MFD side by side. For
collision avoidance or other times you use the
radar intensively, leave the MFD
screen on
radar and do other things (including
AIS -- superlative
AIS display on OpenCPN) on the nav computer monitor. If you can fit the large Furuno MFD and a computer monitor on the same panel, go for it, I would say.
4. No need for a separate
GPS display. I actually love and need the traditional
GPS display with position, SOG, COG, DTW, ETA, etc. but you can get that
screen on any modern instrument MFD like the Triton, and you can display the same information in an instrument bar on the MFD.
OpenCPN will also display this. Much better use that space for another instrument MFD. I have one Maretron DSM250 and one Triton at my nav table, and wouldn't at all mind a second Triton. And that's just a nav station below decks; for a pilothouse nav station I think I would want a pretty complete suite of displays, maybe three or four instrument displays in addition to the radar/plotter displays.
5. Do you
work the pilot from the nav station, or only from the
helm station? You might be able to eliminate the
wheel with the right pilot control and do everything from the nav station. I don't know about the Furuno, but the
B&G Zeus has a quite good pilot control built into the plotter MFD. Add a joystick and you're done.