ok here is the dealio holmes...
Everything you have talked about is in the forums...
The only thing that wouldtough to pull is the cell phone stuff. All and all its possible.
Now on how clean it looks depends on who puts it in. If you put it in yourself, the only thing you could do is just take your time measure twice cut once. Time your packages to come in when your ready for them. Don't get stuck with having your project swinging in the breeze cause your waiting for something. If you do get stuck do little projects (E.I. Route Wires Through Out Car).
Over all have fun with it. You spend alot of time in your car. If you make a mistake and dont feel like fixing it just remember you have to look at it everytime you get in your car.