I am planning a very similar build. Currently waiting for parts to arrive:
NCG FO4ANTNCG mount [Same as yours]
Comet CK-3NMO
Comet CA-2X4SRNMO antenna
+ NMO-5 cap
For the radio brick, I am planning just to use some velcro to put it under the driver's side seat.
For the power part, I am going...