Thanks for words of appreciation!
One more addition, as it wasn't properly expressed in the entry - the Pr.M1121 scale model was technically speaking a craft for research of the underwater hull and wings' arrangements and externally it's "over-the-water" parts bore no resemblance to the planned "full-sized" ships.
@Odysseus1980
The Pr.133 Antares was related to these only indirectly, through the use of the overall results of the R&D work (and it was built in the same shipyard as Pr.11451's), but it had the different hull/wings configuration than the real-life Pr.1141/11451 family.
And responding to Your question from the PM: Yes. The Pr.133 (thanks for the link!) is also on my to-do list for the Small Soviet Combatants thread, which, I hope, will eventually contain as many of the relevant ships as possible, but I can't promise You any specific dates when it will be done (my whole SB to-do list is rather long and for some strange reason, despite drawing new ships, it isn't getting any shorter
).