The more I study the pictures of the set, the more impressed I am.
Under all the tinsel, it is very close to the original TOS bridge design. My guess right now is that the diameter of the set at the inner edge of the surrounding consoles is probably about four feet greater than Jefferies' design, maybe less. The "access corridor" running behind the consoles, into which the original turbolift alcove has been incorporated, adds several feet to the outer diameter. The station heights may be about the same, maybe a couple of inches taller.