No problem. You could always just do the SC now and do stuff bit by bit later on. But to have a good solid build, expect to spend $9,000-$10,000 in parts (supercharger, suspension, wheels, driveshaft, brakes, other little odds and ends). Not including if you plan on paying someone to install everything.
SC Kit - ~$5,000 w/ discount code
Suspension - ~$1,500
Wheels and Tires - ~$1,400-$1,600
Driveshaft - ~$700
Catch Can - ~$110 w/ discount code
Brake Upgrade - ~$1,000 w/ discount code
2016 Mustang GT: Guard Metallic w/ manual transmission; Performance Pack and Backup Sensors