That looks great! I have to say I'm a bit jealous
Just some nitpicks...
First is an issue with the way the 109's are mapped... the spinner on the model isn't just on the spinner on the bitmap, it's also on the very end of the fuselage a little bit. You end up having to do this pixel by pixel and it's a huge pain etc.. IIRC you had some issues with this in the last incarnation of this skin and I think some of it is a bit off now as well, but it's hard to tell...
Also I think the wing crosses are improper proportions but I can't really tell (in any case the black surround shouldn't be there, I don't think, unless it's a reused wing or something).
I don't have access to a scanner right now so I can't scan up the diagrams, but these are the proportions according to the RLM (which stayed the same even as sections were deleted).
The proper proportions for the widths of the various parts the Balkenkreuzen, as defined in 1939 and used for the remainder of the war, are as follows, with b and a being the total width of the marking (for the upper wing and lower wing/fuselage respectively) .
Balkenkreuz auf Fluegeloberseite (upper wing Balkenkreuz)
Inner black cross= 1/4b
White Surround of inner black cross= 1/20b
Black surround of white surround= 1/30b
Balkenkreuz auf Fluegelunterseite und Rumpf (lower wing and fuselage Balkenkreuz)
Inner black cross= 1/4a
White surround of inner black cross= 1/8a
Black surround of white surround= 1/32a
<edit> I actually think they're the right proportions just too far out on the wing<edit>
Also, in the K series the radio hatch was moved had a slightly different shape (also it was only on the left, if you're sitting in the cockpit, side of the aircraft). Again I don't have a scanner right now so here's wikipedia's (very high resolution) line drawing of the K-4 which illustrates this.
http://upload.wikimedia.org/wikipedia/commons/f/f2/Bf109K_3Seiten_neu.jpgAgain it looks fantastic, these are just nitpicks!