Hey man.
Just so you know, it takes a whole lot more hard work and commitment to design a new aircraft for the FS series, so i doubt you are going to get any takers on your design plea. I didnt think it would take as much as it does, but many as long hour has to be put into it.
If you want a really good F-4 phantom for FSX then there is a very good payware by IRIS which is well worth the money, at least it was in FS9 which is what i still run, so i have no doubt it will be in FSX too. Its not overly expensive so take a look, there are a number of people here who will probably back me up on its quality.
Give me a click, then scroll down the bottom and you have two choices of F-4Cheers
James