You know what, I was actually gonna do this, but never got around to it lol. Good job!
Yeah, I did these a while ago and then I moved on to different games (Arma). Recently I decided to mess around with em4 a little bit again and saw all of the stuff that I had been working on, like these skins.
Looks great hooe you consider releasing them as an add on or even replacements to current units in the mod.
I will probably package them, and the dependencies that I have with them (lightbars, led perimeter lights and such) and upload them as a drop in mod for everyone to play around with, maybe this weekend.