Sounds... perilous.
Have you done this before?
Have you bought and then sold ANY timber
land?
Sold development rights for anything to anybody?
Hired a forester on a contingent contract?
Do you even have a credit card with a $5,000,000 credit limit? (You didn't tell us the asking price, but that's what "big working forest" sounds like to me.)
Give us some more details about yourself and your idea, and we can maybe give you some advice.