Hey mate,
About the coffee cups,after some deliberation i ended up sticking with white.
I did some research on them via the net and recieved advice from members on other forums.Some of the cups were issued in white with blue rims,some infantry chose to paint them in green or even red.I have seen on some photos that some tended to put a distinctive marking on the underside so there was no confusion over who's mug was who's.Some painted a dot,others a cross..I do agree though that having a white cup or even a coloured cross outside on their bags was probably an easy target for the enemy.
Generally they were attached by means of sliding the bag straps throught the cups handle.Due to wear and tear i guess the handles would break off the cups and end up inside their field bags.
The netting on the helmets was needed as the Tamiya helmets weren't too great.All i did was find an old gauze badge out of the medicine bag and glued a section to the helmets.There after a dry brush and added foliage which will be seen on my dio.
Thx for looking,Shay