Yeah, the A- and B-Wing helmets are pretty wild looking. I'd love to get hold of a kit of either one of those if they were ever made available!
Scott, what is this "sleep" thing you speak of? 
UPDATE: Feb 14th
OK, these pics show work I did from last night through a little while ago. I meant to take some in between pics, but I was just having too much fun.
I had some left over black vinyl from another project, and I used it to make the "Aurabesh" script and symbols that are seen on the helmet. On the left temple, it's just a couple of strange geometric symbols.
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Here's a closer shot showing some of the chipping. I'm using good ol' Zinc Chrom. Yellow and Reefer Gray. Some areas have a darker gray and for that I'm using SP Lark Dark Gray.
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On the right temple, there's some script. Again, I hand cut some black vinyl and laid it on.
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Here's some of the chipping done above that area. Once the weathering is completed, it won't look so stark against the bare white.
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Across the forehead there's more script. Just to its right (as you're wearing the helmet) there will be a raised dark red rectangle. I'll make that out of some sheet styrene and glue it on once it's painted.
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I also used black vinyl to make the thin black stripes in between the red stripes. More chipping here.
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On the chin of the screen used helmet are the remnants of a sticker. From what I've read it's a "Radio Free Bolinas" sticker that came from an old pirate radio station in Bolinas, CA. I've seen a graphic of the complete sticker, and there's a big white "RFB" on a red background with Radio Free Bolinas in a curve around the top. On some photos of the real helmet it's plainly visible. I used one of these pics to trace a stencil and just painted it on there.
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It will still get some more weathering and some color variation. I'm not sure if I want to add the "Radio Free Bolinas" lettering around the top or not. . . with all the other script on there, it sort of seems odd to add wording that's so clearly readable. I may do it, I may not. So there! 
Closer view.
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This is a fun helmet to paint!