Great question. I believe that it will make this cut for you on an occasional basis, but it will be slow going. The better question is how long will the motor last if you use it commonly for this purpose? I believe that if you use this saw for that purpose on a regular basis, it will not hold up. My father recently destroyed the motor on a 9" band saw by regularly cutting thick hardwoods (not nearly as thick as what you are planning). You would be much better off buying yourself a 14" band saw for this purpose. These units are belt driven, have much more powerful motors, and are built to hold up to that kind of use for a long period of time.
If you decide to buy the 9" unit anyway, I suggest that you get yourself a good 3 tpi low tension steel blade, such as Timberwolf, and really take your time as you move through the cut. If you put too much load on the motor, it won't last long.
Good luck with your decision, and with your project. Sounds fun!