Just my .02
So you want to do the Lambo doors and LCDs in the head rests?
It sounds like you bought the wrong car. Your trying to turn a Sports/ Muscle Car into a rice mobile. You need to buy like a civic or a S200. Those are the cars that people do that stuff to. That stuff really isnt cool in any car but its an embarrassment when its put in a Mustang.
When people see our cars or I see another clean Mustang we say " Wow...... look at that car. Thats a nice lookin car."
When we see cars that have huge wings, crazy tail lights, LAMBO doors and LCD screens whether its a V6 or a Cobra, we say " Wow..... look at that car. What a waste of a good car and money. Hes defiantly a ricer "
I always thought ricers were just foreign cars when I was younger. But its really any car that does stuff like what you want to do to your car. Hell theres even a riced out 05' Vett in my town.

When ever I see it I just shake my head and think what a waste. Dont be one of them people.
This is my .02 if I were you Id do one of two things...
1.) Sell the Stang and buy a Civic or something and do that stuff.
2.) Take the money you have and buy a nice set of rims and tires. Then take whats ever left and add more power to it.
Hopefully you pick #2
Remeber go Nice not Rice