turntable/roundhouse footprint?

[ncc1701]

My current layout plan calls for a 3-6 stall roundhouse on northbound terminus of my line, I plan on using the atlas turntable/roundhouse for the sake of simplicity. I have a limited space but I would prefer 6 stalls if possible. Therefore, I ask anybody who knows the roundhouse footprint dimensions to please list the information on this thread. I already have the turntable and know that it's diameter is 7 and 1/2 inches. Is it safe to assume that the round house stalls are the same?