Thanks Judy,
I don't have good access to our Monty, or I would give you the Monty cabinet dimensions.
I couldn't give a good opionion on any of the differences between the Monty or Big Sky, as we haven't even used ours yet. I'm more at the stage of "Wow- we have a TV, Wow- we have a desk, Wow- we have a refrigerator"
Those that fulltime probably have a much higher criteria than me. Either model looks very liveable, and the new features on the Big Sky are great enhancements to the Keystone fleet. I think they have a hit with this one.
Brad