The Hobby Boss is based on a Golf I that was sourced from the USSR and built in China prior to the Sino-Soviet split. As such, it was originally configured to fire the Soviet liquid fuel 350 nm range R-13 missile, which was surface launched. It was modified by the Chinese as a test bed for their solid fuel SLBM.
The Russian Golf II were conversions of existing Golf I submarines to carry the 750 nm liquid fuel R-21 missile, which together with the new D-4 launch system, could be fired while the submarine was submerged. Some minor external changes to the submarine, mainly in the sail area.
The plan sets I have ae roughly 1.5 meters by 1 meter, with full internal details of the two Golf submarine classes. They have Cyrillic legends and were obtained from....sources back in 2007.
My Golf II resin kit was sourced from a company in the Russian Federation. email me and I can tell you how to contact them. The above Arsenal 2 models look great, if you can wait until the Fall.