Depending on how much time you have, you could just bring the guitar itself around to the different people, they could leave their mark (whatever it may be), and then on to the next person. Besides if you're wanting to get a bunch of people in on it, it's not like they'll each have to take up a lot of real estate on the top, and the amount of time each person took with it probably wouldn't be very long. If you didn't have to chop it up it might be a bonus. Good luck either way, sounds like a cool build.