That first kit is a later large hatch M4A2 76. That's one of the other lend lease Shermans that the Soviets used. Note the distinctive glacis plate with no bulges for the crew hatches. The final link is also dedicated to that model of Sherman.
That second picture is interesting. I'm not sure what the log arrangement on the rear deck is, perhaps an addition for tank riders. definitely no shelf though. I wonder whether it was removed or was never installed.