Just a word of advise.
If this is a 6 year project then paint should be the last thing you do.
If the car is in and out of mechanics places and various other garages for work, or even your own for that matter. The last thing you want to worry about is scratching, denting or what ever with the paint work. And it will happen if working around it for 6 years.
Do everything else then paint it. Besides you might lose interest over 6 years like many others on here and you will have wasted your money on your paint work. As we all know you won't be getting your money back.
Have fun and good luck with the project.