Wow, not often you see a real one! It looks like a genuine Arduino (=expensive!) but for our purposes that
is an 'ordinary' Nano and should be fine to use in the Redboard
The problem with documenting is (as you've discovered) that the available boards dont stay still, designs come & go, presently I'm struggling to find our beloved "DIY-More" board, but we'll get by one way or another
Until your post I didnt realise the Redboards that James gave me were any different...
So, on with the project, keep us updated!
I've found the Redboards 3v3 puzzle to be odd but harmless on a standard Nano which only has the very low current 3v3 from the CH340G serial chip, but unsuitable for an RF Nano which has a proper AMS1117 regulator - with the two regs in parallel I found the RF Nano regulator gets hot.
I honestly think its a design flaw but can be ignored with an ordinary Nano, we've been flying redboards for years now!
By coincidence James (of Sticks & Tissue) recently gave me some Redboards, and looking at one they're the same as yours Wayne, outwardly they look the same as the Funduino but its a different track routing. Anywho, I had a shufty under the microscope, then cut the track suggested above, and can confirm all is well. When I get a mo I'll add it to the document although the use of Redboard is less common now.
Heres the track cut, between the annotations for Vin and A0. This frees the 5v pin to be used for power to the RF module - see the Reeduino doc.
So right to left these 5 pins are used as follows. two for battery power, and 3 (servo plug) for the RF module:
VIN - switched positive power from the battery (2S lipo etc)
G or GND - battery neg, a 2-pin JST socket will fit these 2 pins
G or GND - RF module neg
Vcc - this is the repurposed pin feeding battery voltage to the RF module via the short wire loop to VIN
NC - 'no connection' pin used for PPM, connected directly or via (say) a 1k resistor to Dn, whatever PPM output is used (usually D13 or D0)
RST - unused, no header pin fitted