I recently purchased another model that came with a 1/144 Type 61 5+, and the instructions showed more of a Imperial Japanese Navy Gray (Kure arsenal) XF-75 color. The tank also comes in a Desert Yellow, the same color that the Germans used in Africa in WW2. The only time I’ve seen this tank in Gundam is in 8th M.S. team (in the opening credits)-and there it appears to be a Gray in between IJN Gray (aforementioned), and Sky Grey.
The tank (as far as I know) makes no major appearance in Gundam, and keep in mind: it is Scifi-make it how you like.
sorry to prove you wrong, but they play a huge part in the fairly recent set of mini series, MS Gundam: IGLOO
which focuses on the early parts of the one year war, specifically from the first real implimentation of Mobile suits in combat up to the First Gundam sightings, as far as I remember. So there is alot of emphasis of the EFGF infantry and armor.
As far as color, They like to keep with alot of WWII schemes when not using the bright reds and blues and yellows of the original anime colors.
For the tank, I would keep it to whatever area you meant it to be in. what I mean is, paint it like you would any tank, if you want it to look like it does in the series tho, I would go with the colors you would use for Israeli armor
Thanks. These pics are some of the ones I found in the directions I was talking about, in the 1/144th kit by HG and Bandai, MS-06 Zaku The Ground War Set, which comes with two Type 61 5+, shown in the directions to be a grey that matches the IJN Gray.