Well to be honest I sort of went down the rabbit hole thinking I needed a few of them and then I sort of inherited some more from someone.
My plan was/is to have the Mega as the master controller using the UNO's as subsystems. Each subsystem will have NRF. (because I have them also).
The controller will have leds, switches, NRF to control the subsystems:
Sub 1:Servos 10 of them 9g MS18 with a PCA9685.
Sub 2:Signals 8 leds for each servo with a switch register output.
74Hc165/74Hv595
Sub 3:Lighting for outbuildings with a switch register output. 74Hv595
Sub 4: Throttle master L298N motor driver and slave (to be remote controlled)
buttons, led Rotary encoder KY-040
Sub 5: Possibly some sensors - if I live that long.
So you can see that power will at some point be a problem for me - hence I would like to know what will be needed possibly as a starter that can grow.
Don't know if this helps or not just need a little guidance on the power at this point in time.