There appears to have been several "variants" of the J5550 produced; probably fooling around with bedding, stock strength, etc.
There also seems to have been some "dispersal" of the surviving examples; there is at least one complete action, (no barrel), and a stock here in Oz. The interesting thing is that the stock, though completely finished, would not correctly accept the action that came with it. Variations on a theme? The trigger-guard attached to this body was steel, unlike the one in the video and the ex-Bob Farris one shown in
Skennerton
's ""Lee Enfield Story". Could these latter two be the same rifle?.
Part of the problem with the design is that there was not a lot of surface area of recoil-lugs on the body or bearing surfaces on the stock, and as recoil of the body was transferred via a slightly beefed-up "tang" at the rear of the body, there was VERY little wood to absorb and transfer this force without risking splitting the timber. Maybe, if glass-filled nylon had been around.............