It's crossed my mind, but I don't think you'll find a benchtop model that has the beef to effectively cut through timbers at an acceptable weight. Not to mention limitations on throat capacity.
I'll bet the balance is way off on those too once they are off the table.
If you can find a benchtop model which will buzz through an 8x8 and has a decent weight and balance than why not give it a try? Let us know if it works.