Lars point is, it would be better receiving at least a "rough" version of a cloaking-system than getting nothing, because we are creating a science out of it and want to do everything 1000% perfect. With a simple version, at least every mod could use it and think" man, it's not perfect, but at least it works and I can stick to my universe" It's still better than to have skip away special features or models (of course I talk for my mod in the first place, but I'm sure others may think the same).
Look, I'm not trying to say "code something half-assed, buggy". Just make it simple for the beginning, and then there will be always room for improvement. Isn't that the way things usually go ?
And while speaking of it, forget the AI. It's understandable that this is a hot area coders won't touch, since it can break many things. But IMO it would be more then enough if we can receive a way where the models fade out slowly (and I have to remind of phreaks first try in this, which was really cool). Once this is done, make some new FRED-SEXP (O.K, I don't know if they can be done that easy, but I hope so) and then the fredder use the "everytime argument " to cloak his ships when the shields are low, and maybe a chained one to uncloak again. I can't imagine that so many cloakable fighters are planned in one mission, so controlling them with SEXP would be a good start.
Personally, I would be happy if I could cloak my ships just once while in a mission (so that not to much scripting is required). It's not perfect, but it would be more than enough. With good scripting a lot of things can simulated.
@Phreak : I really can imagine that you find me annoying

, but you once said to me that it would be not that hard to bring it to Direct3D and make those SEXP. Please take another thought into this matter, it would be really a great deal for the WCS Mod and others too

Though I have never seen your effect in real motion (I know only 3 pictures), I think some sort of inceasing/decreasing map-transparency could also be enough. There is no need for a fancy animation (for the first version that is). The only thing that should be included is a cloak sound, and that could be also done with the SEXP-variant and it should be usable on every ship, not only AI-Ships (and they must cease from firing while cloaked, but certainly that can also be controlled within the same SEXP)
What do you guys think of this solution ?