A nice set of clones there. I like the weathering and paint apps on the galatic marines. The only thing I don't like about them is the fabric used. The fabric in that scale looks too course and holie. A finer fabric would have seemed more in scale to me. I think it needs to be trimmed a little. Over all very well done figures.
As for the 501st SA/w removable helmets, I think the Evo clone came out the best. The letter A on his chest seems to be the most accurate. I like how the A splits at the end. It's funny how when making the same figure three times we get completely different looking figures.
Cool. I like that color green you used. It goes well with the light blue one. You forgot to add the little band around their left leg. For that I just used electrical tape. The hair came out really well. I think the green one's hair is the better of the two. There seems to be more of it. Its funny how making the same figure twice they can come out so different.
As I said over at the Jawa, these are great figures. I like the red strips on the uniforms. I think the pit helmets are too ww2-ish. I think a Cobra Crimson Shadow Guard helmet would be a great touch for these. But I know your going for the warhammer look in that case these are perfect.
That head detail is really good. I like the texture of the hair. I think they are going to turn out great. Maybe the next group project I should shorten it to two weeks instead of six to get you going.