I thought the same thing, too. Really the only difference between the 50/52 is the 2 seat cockpit, flir ball, new avionics, stuff like that. Same weapons, same engines, same airframe, all that. Should be a breeze to model... ah who knows.
The airframe should be very similar indeed, but the 2-seat cockpit, FLIR (don't forget the radar either!) and avionics represent huge differences in their own right. It's in many ways a bigger jump than going from the AH-64A to the AH-64D, so don't underestimate effort required to model it. Particularly so the second crew member - that alone pretty much kills the idea dead for the near term, IMHO.
Those Ka-52 drivers sure have a nice office though:
http://s59.radikal.ru/i166/1104/08/031ef37740cf.jpg(production version cockpit, AFAIK)