So I was messing around with the Halo 4 poster and then decided to turn in in to a diagram for a possible Armoury System.
NOTE: I do realise that 343 have said that the final Mark VII will look different, but this is the best image I got.
The Green section of the Helmet is the default veriant. It determins the basic look of the Helmet and the shape of the Visor.
Firstly, you would have to choose a base armout veriant. Mark IV (Halo Wars Red Team), Mark V (Halo CEA), Mark VI (Halo 2+3) and Mark VII (Halo 4).
This would basicly determin what your Legs and Back looked, the black webbing looks like, and other small areas not covered with your choise of armour.
The Upper Chest area would be basicaly like the chest works in Halo 3 and Reach. Pretty self explanatory.
The Lower Chest would incluse the cod piece and other items such as the UA Multi Threat Belt
The Shoulder Base would work exaclty as they did in Halo 3 and Reach but would come with an optional attachment.
The Shoulder Attachment could either be a continuation of the Shoulder Base design, or it could be a seperate item such as a knife or ammo clip (just for looks).
The Arm Attchemnets would be similar to Halo Reach with the Wrist attchments.
The Hip and Thigh Attachments wouldnt be anything that would stick out and look out of place, just mearly design alterations for a bit more customisablitlty.
The Hip Attchment however, would be similer to the Utility attachments in Reach, like the UA/NxRA.
Well, thats all I got.