Val...since no one else is weighing in and I do have some knowledge of land based installation issues, I would suggest that you will run into significant problems with anything less than a straight run of pipe that contains not more than a 30-45 degree bend. to get it out of the cabin.
I will willingly defer to anyone who has actually done what you suggest, but small pipe draft is tough enough without the complication of multiple severe bends.
I realize this, and that's why I'm asking. It's possible the use of a fan can mitigate the angle issue. It's also possible I'm smoking crack on this idea of wanting to avoid putting yet another hole in my cabin top.