1) Go tape up where the body kit could rub and find out how it fits.
2) You get what you pay for. To paint my hood. It cost about $180 in materials. And I was doing it myself. Find a couple shops around you and get a few quotes.
3) I am asuming you are not going with a full roush setup and you are just going to get some pipes bent at an exhaust shop. Ask them if they have anything. Take a look at these.
Just remember, most tips cost around $60-$100, I would just go ahead and either wait and save some money and get the Roush tips. Or just bite the bullet now, you've already spent close to a grand I'm sure, whats another $170 when you want to do some things right.
Good Luck!