I was kinda thinking that #1 looked like a Javelin or AMX... The very LAST one gets my vote. It would be interesting to be able to build a shroud behind the lower valence opeing and force every last bit of air through the rad.
Try one with the lights in the lower grille like you see on the some of the early Stangs. Below the bumper in the middle and close. Just would like to see that look.
Great creativity but....... I really like the first one in the second post because it looks mostly stock! Sorry, no offense but I think the stock maverick grille/front end is perfect the way it is! If you want to play around some more though, take the first one in the first post and flip the grille opening moulding upside down, ala new shelby look.
I know, but it's fun givin out these ideas. Maybe it will inspire someones build...Besides, how many people have said "nice mustang" to you?