https://en.wikipedia.org/wiki/Lun-class_ekranoplan
To my surprise it is in the database, however there are some errors, or so it seems if the wikipedia article is right:
The project itself is called Pr.903, not 902R.
Apparently it is a ship, not an aircraft. If you add it to a scenario may fly between altitudes of 30 m and 3000 m, while it should just "glide above the surface of the water".
The antiship missile was a Moskit, not Zubr, the confusion comes because there were several SS-N-22.
https://en.wikipedia.org/wiki/SS-N-22
The cannons are included, however the frontal has an arc of 360, I do not think it is right if you look at the position in this graphic by HI Sutton or at the pics aboce.


