gplamer:
I don't have the exact details on this as I don't mill in NY State. But, there is a set of rules in New York state that will allow you to use your own trees to build your own building if the sawyer can verify the quality of the timbers he mills for you.
He has to sign a paper that says he's sure your timber are grade two or better.
You'll have to do some more research on this and find out the exact procedure to allow you to use your own timbers from your own tree. But it can be done.
Good luck with your project.
Jim
PS. If some one has a link to the info could the please post it? Thanks