Hi again Pete.
RLM is an abbreviation of "Reichsluftfahrtministerium" which was the German equivalent of our Air Ministry. It standardised aircraft laquers/paints into various groups and assigned each colour a numerical identification. That number was equated to colour cards which the various laquer/paint manufacturers had to match. You will read verbal descriptions of the colours (black-green,dark green,black-grey etc) but these were not used by the RLM and even more confusingly varied between different aircraft manufacturers who had a habit of putting a verbal description,in brackets,next to the RLM number on their camouflage diagrams!
As an example the main camouflage colours on your model will be a splinter scheme of RLM 71 (a dark green) and RLM 02 (a grey-green) over a lower surface colour of RLM 65 (a light and surprisingly bright blue). Many model paint manufacturers make RLM equivalents and most paint comparison charts will give RLM colours.
The basic cockpit and wheel well colour is also RLM 02. The landing gear struts are almost certainly RLM 02 without good evidence to the contrary. The inside of areas like engine cowlings would also be RLM 02 as would the engine bearers. The instrument panel may have been RLM 02 but could easily have been a darker grey (not black) like RLM 41 (?haven't checked that number and my memory isn't what it was!) or even RLM 66.
Wheels a semi-gloss black.
There are a few potential anomalies,dependent on the history of the airframe,for example whether it was an upgrade from an earlier version as many E-4s were.
If you go for Wick's machine let me know as I have some photos which show that the kit's painting instructions are not quite correct.
Cheers
Steve