You're looking at a mini mill I think, which would be smaller than an RF30. I wouldn't think there'd be much difference in the table height (distance from table surface to the bench top) between a mini and an RF30, so I bet the form factor's the same.
At any rate, I'm thinking that 40" will not be too high for you. I have my Gorton 8D set on a pedestal so that the table at typical height is about
46" - 48" high. It's really funny to see al shorter visitors stand on their toes to get a look at what I'm doing. On the other hand, I have to stand on a milk crate to loosen the drawbar...Peter