I'm with Erich regarding the colour scheme. It'll need more research to determine the antenna too, as the dates are just around the time of the chnages to the equipment.
Regarding the Humbrol paints. First, RLM 70 is Schwazrgrun (black green), not one of the greys.
Humbrol used to do the colours in the old, much missed 'Authenticolour' range, and i keep old tin lids in order to match the colours, which I mix myself.
The interior would not be RLM 02, but RLM 66, which is half a shade darker than Humbrol 27 grey. The RLM 02 was replaced with '66 as of 1941. However, the interior of wheel bays and such is RLM 02, and i mix this with a roughly equal mix of Humbrol Green 30 and grey 27, and add a spot of white. Note that RLM 02 could, and did vary, and appeared lighte on internal areas, compared to when used as an external camouflage colour.
The greys which would have been used on the '110G-4 would have been RLM 76 overall, with the mottle or welle (wave) pattern in either RLM 74 or 75.
Again, Humbol 27 can be used for the 74/75. It is made about half a shade lighter for the 75, and quarter to half a shade darker for the 74.
I mix RLM 76 a number of ways. If you think of it as very close to RAF Medium Sea Grey, but a touch lighter, and with a slight blue cast, then you'll be able to visualise it. That's the overall base colour seen on my '110G-4. I normally use a mix of light grey, around about Medium Sea Grey, and add a small amount of Humbrol 65 (which is also a straight use for RLM 65 Hellblau).
I know this all sounds vague, but i've been doing it for so many years, that it's virtually second nature, and i know when it looks right !