That gun pod is provided as an option on one of the older Su-15TM kits (VES or Amodel), or with either the Hasegawa or ICM 1/72 Russian weapons sets. I don't remember specifically now, but if anyone really wants to know, I can check later when I'm at home.
Re the nosewheel door, this is closed possibly as a design feature to prevent foreign objects on the runway from being tossed up into the wheel well by the front wheel during taxiing and takeoff or landing. This was a consideration on Russian aircraft because of the desire to operate from less-well-prepared airstrips than is usually the case in the West. Or, when the aircraft was put on display, *maybe* they closed the doors to keep squirrels from nesting in there...
One well-known example of an aircraft whose main landing gear inner doors were designed to be closed when on the ground (but to avoid obstructing the radiator intake when taxiing) was the P-51 Mustang!
John
