Hi It's almoast 2010, lucky you..
Some of the equipment you hav listed simplifies the installation as it supports NMEA 2000. NMEA 2000 is superior to the old NMEA 0183 standard and simplifies cabling. NMEA 2000 uses a backbone cable with t-connectors and drop cables.
But you will have to use at least two(three) different network types.
NMEA 2000 can be used for the Garmin equipent listed, but you must use the "Garmin Marine Network" to connect the radar to the diplay since NMEA 2000 (and 1083) does not support radar images to the display unit.
All raymarines equipment supports seatalk, the S1 unit also supports NMEA 2000 with a proprietary adapter (please verify - this modell has been replaced by the SPX series), this can be used to interconnct the autopilot with the chart plotter.
You should be able to get heading data from the S1 fluxgate compass (you will need this to get radar overlay on the chart plotter). Please verify that you can get the rate gyro heading this way as this is normaly e requirement for good radar overlay.
The Furuno FA50 seems to be able to communicate with the plotter using NMEA 0183, it can also use ethernet to communicate with other Furuno devices.
Raymarine 218E DSC VHF will have to use NMEA 0183.
The garmin 4210 plotter has 4 receiver (RX) ports and 2 transmitter (TX) ports for NMEA 0183, so this should solve your problems.
But as you can see it will be some cables going to the plotter.
NMEA 0183 Cable (one cable for all ports)
NMEA 2000 drop Cable
Garmin Marine Network cable for the radar
I will advise you to pull all the necessary cables even if you wont use all in the start.
Are you going to shop all this equipment at one supplier? Try to get a guarantee that this configuration will be interoperable.
I must tell you that Raynmarine is notorious in telling that even if the support standards the can not interoprate with other equipment
The Garmin documentation for the plotter can be found here https://buy.garmin.com/shop/store/ma...=148&pID=11187
Take a look at the "Installation Instructions"
Good luck, keep us updated.