Their is nothing wrong with building a look a like.
The difference between the Marquis and the Marauder is basically the motor.
Seeing the mustangs use pretty much the same motor as the Marquis performance parts should not be hard to find.
Superchargers are available for the Marquis and the Crown Vic if you had rather go that route. www.superchargersonline.com
If you decide to use a 2002 or earlier Marquis/Vic you will have a larger selection of (mustang) rims to choice from for your car.
You could also create your own "shaker" hood or make other changes to your liking, have fun with it.
Later,
Bowman9
Modifactions:
SuperChips Custom Tuner 9100 (Lidio)
180 Degree Thermostat
Ford Motorsport 4.10 Gears
Steeda Underdrive Pulleys
K&N Coldair Kit