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Sadly, you are a bit out of luck with adding 900mhz to your Taranis X9D plus as FrSky no longer offers a 900 mhz module for that era of radio. There aren’t re other options though, something like a TBS 900 would do the trick, but I can't help you with that setup. But basically any receiver that outputs Sbus will do the trick.
For the 2.4ghz side, just pick the receiver you would like to use, bind it, and connect the "Sbus Out" of that receiver and connect to the "Sbus In" on the RB-20. On the RB-20 they call this "RX1 In" and RX2 In". For receivers, doesn't need to be anything big, this will do the trick:
This tiny little receiver weighs just 1.5 grams, yet still packs all of the great features of its predecessor, the XSR. SBUS, CPPM, full range, full telemetry, Smart Port to add sensors. This alone would have made it very popular, but FrSky added 2 new it
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It is full range and saves space in the plane. The receiver will get its power from the RB-20. You will have 3 wires running to it, red, black and the Sbus line.
Looking around the internet, I'm not seeing much on this, if you like we can set one up and take some pics so you can see the wiring.
The FrSky SBUS Decoder allows you to connect normal servos to your SBUS systems.
alofthobbies.com
That would plug into the Sbus out. You will use a Channel changer to set the channels it outputs and then plug in your servos to it.
Or you could use FrSky Servos or Sbus servos. We offer both options.
Word of warning, when using this many servos PLEASE play close attention to the amp draw of all of these servos. You may well need to use a power management system to safely and reliable power all of these servos. I assume you are aware of these concerns when building something this large..?