After tinkering around with some headswapping, I thought I'd start a thread on it that we can have handy for those curious about what heads work with what figures, and which maybe barely do, perhaps with only slight modification.
I'm not entirely sure how to do this thread, actually... if I should just update the first or second post with the headswaps that work, as they're submitted, or what we'll do, but we're going to give this a whirl as something to have handy here as new figures come out.
I'm going to ONLY include heads that need slight, or no modifications... This is less a thread for customizing, and more a thread for swaps that aren't terribly hard for anyone to do, or more for heads that require zero modification at all.
Base Figure:
Compatible Head & Details:
-2003 Saga Captain Antilles -2010 Vintage Endor Rebel (No Modification)
-2010 Vintage Endor Rebel -2003 Saga Capt. Antilles
(Requires slight filling of the head for
fit)
-Build-A-Droid Bespin Guard
(Requires painting, or swap to the
Black Variation Trooper)
-BAD Hoth Rebel Body -Vint. Rebel Fleet Trooper
-
-Vint. Rebel Fleet Trooper -BAD Hoth Rebels
(All Variations)
-
-Vint. Endor Capture Luke -Vint. Deleted Scene Luke
-Vint. Deleted Scene Luke -Vint. Endor Capture Luke
This is a work in progress, and will only get my attention when I have the time, which isn't often these days, but I'm just giving fair warning, and don't be offended if I don't get to your suggestions right away.

I'll try to stay on this as much as possible.