The Atlas roundhouse is designed to fit their 24" table at the exact spacing between the tracks and at that precise distance from their 24" turntable. To fit your 33" table, you have no choice but to shorten the apron distance unless you perform major surgery on the structure itself.
As far cutting down the apron, that can be done with a hobby saw. However, I think the roundhouse will look odd sitting that close to your turntable.
