Part of the reason it probably works so well for the 240/260Z is because they don't really have a lot of interior anyway, so making the rest of the car match properly isn't too difficult. If you've ever been in one, you'll know what I mean. Even the door panels are crazy flat compared to the MkIII, although the interior door releases are in a pretty intuitive place.
Even if it did take me 15 seconds to find it before I could get out.