Ok posting it here cause this is were it started at I'm using some of the parts from the JS-2 to make a KV-122.
I got the JS-2 Barrel and mussel brake from Tamiya USA .
The lower hull is metal Asiaitam KV-1 the upper hull is HL KV-1 with the KV-85 turret from Juckenburg converted to having barrel mount re sized to fit the 122mm JS-2 barrel .
The recoil is in using servo recoil have not installed the elevation mech yet but it will be a HL one .
So here is how it looks so far .

Thanks
Jimmy