AH1,
My shop schedule is booked solid well into next year but paint and interior are the two things that I do not do in-house so those things I could do for you. By coordinating my schedule with both of them only a few weeks ago, I know that they both are not backed up right now so are available.
Depending on your state (or Country) and whether they are one of almost all that have adapted the SEMA Model Legislation, it will be titled as a Replica, body style Mercilago.
Speed and sound is up to you and your budget for the engine/transaxle drivetrain. Remember the words of the late Mickey Thompson "Speed is expensive, how fast do you want to go?". Fortunately that is not quite as true with a relatively lightweight car. The simple power to weight calculation will tell you everything you need to know about how fast, 400HP-500HP is all you need.