Well, "Guards Rocket Mortar" vs. "Guards Mortar" aside (and yes, "Guards Mortar" is the way I have always seen it in Russian-sourced material), my expression of disappointment is about the subject matter of the model, not the label applied to it.
Or I should say, the subject matter that is not modeled. No actual complaint about what is modeled. Just disappointment about what never seems to be modeled.
I've seen Katyushas modeled on Studebaker trucks (as this one appears from the box art, if I trust the rendering), which would probably have been the dominant mounted version in 1944 and 45. And I've seen them modeled on ZiS trucks, which would probably have been more common in 1943.
But what I have not seen modeled* is the non-SP Katyusha rocket system(s). From my readings (and pictures I've seen) the ground mounts were the dominant type in 1942, and probably in 1943. And the ground mounts were still present in numbers through the last offensive on Berlin.
And everyone wants to do the BM-13 (13cm) version. What about the 8cm, the 24cm, or even the 31cm versions?
How about a M-8-12 trailer or sled? Or an M-31-8 trailer?
And while we're at it, what about a SP mount that isn't on a truck? Like a BM-8-24 on a T-60 light tank, or even a BM-8-8 on a Willys jeep?
So many Soviet barrage rocket types, but we just get replays of the same thing again and again.
Sigh …
-Mark
(aka: Mk 1)
*Note: Maybe they are out there somewhere. But I haven't seen 'em.