Since you're sticking with all one manufacturer, any NMEA 2000 bugs that are currently out there shouldn't bite you on the butt too badly.
The GDSxx series sounders are for using the multifunction chartplotters, particularly the smaller stand-alone models, rather than the bigger modular units, as a fish finder. You shouldn't need one for just depth data, since the triducer will provide that.
You will probably want a box to connect the autopilot and DSC VHF to the GPS at a minimum. IIRC, the 4208 will have NMEA 0183 connections as well as NMEA 2000 ones, so you may not need a separate interface box.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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