Upgrade from C90W to Axiom keep other devices

[bpaniccia]

Hello,

My c90w has died and I'm looking at replacing it with the Axiom 9 chart only version.

Other equipment I would like to keep and related observed wiring/connections:
1. HD Color Radome E92142 (added new in 2014) connected via Seatalk HS NET (E55049 Rev r cable)
2. SmartPilot X30
3. ST7002 control head
4. ST60+ Wind, Speed, Depth
5. DST800 tri-ducer (not sure yet if its NMEA 0183 or 2k)
6. ICOM DSC VHF IC-M422 GPS from c90W output into NMEA 0183 on VHF

I see two sets of splice connections from the c90w main power cable port to what looks like 2 seatalk black cables.

the first includes black white, red white and yellow white

the second includes solid yellow to yellow st1, solid to white st1 and (brown and gray) spliced to the ground

Questions

a. Will the axiom support my radar E55049 cable or should I look for a later version?
b. Will the seatalk 1 to seatalk ng converter kit part E22158 cover the other devices?
c. How is my current setup sending out to the NMEA 0183 for the VHF GPS signal?
d. Can I put the E22158 mg backbone into the back of my navpod and connect the existing wire runs into from there or is there an upgrade needed further down the lines requiring pulling down my headliners and routing new cables.

Thanks in advance
Brian