It's my first tank however not my first detailed model. I have built highly detailed model wood ships with very fine detail as a former ebgineer I like the detail stuff

Well, the best I can tell, the turret interior is olive drab and the hull interior is white on a Hellcat.

S.M.

I did purchase some proper scale stowage... I would like to get access to a  book describing tank parts and interior equipment 

I will look at the provided websites for further detail

thanks

Look at this site for some great reference photos, many taken from the original Tech Manual. Those show a mostly OD interior for the turret and hull below.

http://afvdb.50megs.com/usa/m18hellcat.html

If it's your first tank,try a regular closed tank,less decisions and detailing,by the way,did you come up with any stowage options as per our suggestions.

The interior of American tanks like that were OD,see this link https://www.google.com/imgres?imgurl=https%3A%2F%2Fc8.alamy.com%2Fcomp%2F2MEWYRT%2Fm18-hellcat-turret-interior-2MEWYRT.jpg&tbnid=fft6YaZ_9ChUzM&vet=1&imgrefurl=https%3A%2F%2Fwww.alamy.com%2Fm18-hellcat-turret-interior-image508276492.html&docid=EHTbLsGqFvsdCM&w=1300&h=1015&source=sh%2Fx%2Fim%2Fm4%2F2&kgs=8ca21d252398c025

watch this video.

Tank Overhaul - Episode 4 - The M18 Hellcat

Thttps://www.youtube.com/watch?v=BKkQzFAiOA4ank Overhaul - Episode 4 - The M18 Hellcat