Here's a site that sells uniforms for reenactor groups. The colors should be fairly accurate, plus you have to factor in wear and tear, age and sun fading into your colors, so the margin for error is pretty wide. There's no camo smocks there, but none of the figures in that set are wearing any camo anyway, and all of the uniforms present in that kit are available through that site, except for the great coats and the capes. The capes were olive green, roughly the same color as the 1943 pattern men's blouse, and the great coats ranged from a very dark brown toned OD to an almost tan OD to something like the gray side of German field gray.
http://collectrussia.com
Scroll down to the reenactor stuff and click the links you need.
I think the figure build ups are fairly obvious, but the instructions never hurt. It never hurts to order them. If you can wait until the weekend, I'll have time to scan the instructions. I'll see if I can make them into a PDF, but it may have to be some jpgs.
As far as the sprue goes, that's up to you. Though the two sprues contain equipment for all teh figures, so without one of them, you don't have weapons and equipment for half of them. I think DML had a WWII Soviet weapons kit, if I recall correctly, which would have everything you need and then some, but I can't find it on the web. I'll have to check my parts box and see if I have any Soviet weapons in that dark grey plastic they cast their weapons kits in. I'm certain I have a Detyarev cast in that color, though maybe that came with a DML figure kit. It's been a few years.