I joined the boards over here so I can actually post and not lurk. I'm working on 2-4. Comic is ordered so I can make scans as that should be the primary source material. Action figures sometimes are stylized and may have details that vary from the original material. If someone has the Encyclopedia or the Campaign guide and can upload any photos from there, that would be a great help.
What we've worked out so far:
Helmet: definitely TK, paint scheme/detailing might be a bit different. Someone here should weigh in and let me know what you can make out from the pictures.
Shoulder and upper arm and hand armor is TK build. I know there are some variants (from movie to movie) and I don't know if one of the guys here wants to take a look and tell me what specific build those pieces come from. (Hey, they might all be the same, I just am not too familiar with the tiny details of TK armor)
Lower arms: haven't been able to find an exact match, but probably a Clone build of some sort is closer as hers doesn't have the same detailing as a TK. I don't want to declare these for the custom-made section until I'm sure.
EVERYTHING on the torso would definitely have to be custom made. The chest plate (and corresponding back plate) is cut much higher and angular in order to fit in the chesticles, and the lower pieces fit almost like a corset, as it curves in at the waist. In addition, someone pointed out that they look as if both are connected fully rather than being open on the sides like a TK. I can't get a good look at the lower back piece to tell what's going on there, though.
As for the two pieces around the butt (I would call it a cod piece, but that kinda doesn't apply), the front piece is a perfect triangle, but with the same detail work as a TK, and the back appears to be perfectly rounded rather than having the funny angular shape of a TK build. It does have the same cylinder on the back, but we'll need a close up to make sure the details are the same.
Belt is pretty close to some TC builds that I've seen. There's quite literally a million variants for Clones, so we may be able to find an exact match, or at least hobble one together from various pieces.
Leg armor: this is where it gets fun. I've been looking at a ton of pictures, and I think the thigh and calf armor could come from a Clone kit without a ton of modding. Unfortunately the knee armor bits are exactly in between the movie TCs and the CW TCs that I've seen, which is kind of annoying. Again, maybe one of the guys over here (or on the Clone Trooper forums) could figure out if there's a Clone build that's the closest, or else these will also have to be custom made.
Boots are all white with white treads. A pair of women's wellies are the exact right shape, but we'd need to find someone who makes them in vinyl or leather and not rubber. Otherwise, a pair of combat boots with a special leather mod to hide the lacing would be the next best thing I could think of. I feel like some Clone Troopers might be able to help us there.
So yeah, that's what I have so far. Mostly a lot of looking at pictures and comparing the details. I'm trying to figure out each piece, and it's a slow process. Feel free to contribute!