Design A-120 was strongly connected to the previous A-119 proposal. This design probably the modified version of 14 torpedo launcher armed A-119 variant as the drawings show exactly the same hull and layout having only difference in the number and layout of torpedo tubes! Weirdly this design was heaver by 2.000tons despite only mounting 4 53cm torpedo tubes which could be the result of restoring the underwater torpedo bulkheads in the previously spaces allocated for the torpedo launchers
The design had the following characteristics:
Dimensions: 243,84 (pp) x 260 (oa) x 29,57 x 9,14 meters
Displacement: 40.400tons (standard)
Armour: 229mm Belt inclined at 25 degrees, 76mm Deck, 51mm at Machinery 76mm at Magazine Slopes
Engines: 124.000shp Gihon Steam Turbines, 4 shafts
Range: 10.200km at 30km/h (5.500nm at 16knots)
Speed: 56km/h (30knots)
Armaments:
5x2 410mm/45 Type 3 / 3rd Year Type Cannons,
20x1 140mm/50 Type 3 / 3rd Year Type Guns,
4x1 76mm/40 Type 3 / 3rd Year Type AA Guns,
4x1 53cm Above Water Torpedo Tubes
Original drawing:
https://iiif.dl.itc.u-tokyo.ac.jp/repo/s/hiraga/document/b826131a-236c-46d3-b265-04fa73999c4c#?c=0&m=0&s=0&cv=0&xywh=-1988%2C0%2C10918%2C4927
Data table:
https://iiif.dl.itc.u-tokyo.ac.jp/repo/s/hiraga/document/62342cb9-e432-49c6-b8da-767bbf081fed#?c=0&m=0&s=0&cv=5&xywh=969%2C481%2C3551%2C2118
https://iiif.dl.itc.u-tokyo.ac.jp/repo/s/hiraga/document/d059f655-21b8-4530-8979-ce9ac0733c10#?c=0&m=0&s=0&cv=23&xywh=1268%2C337%2C2118%2C3551&r=270