Tank i guess...

According to Wargaming:
Developed at Factory No. 183 in 1944. It was based on the T-44, with many components modified to enhance the armor and armament of the new vehicle. According to one source, the first prototype was built at the end of 1944. However, some other sources mention another date—January 1945. The tank underwent trials in March and April 1945, but never entered mass production.

According to Wikipedia (Prototype)
Efforts to fit the 100 mm gun to the T-44 demonstrated that small changes to the design would greatly improve the combination. The main issue was a larger turret ring, which suggested slightly enlarging the hull. A prototype of the new design, about 40 centimetres (16 in) longer and only 10 cm wider, was completed in 1945. This model looked almost identical to the original T-44, albeit with a much larger gun.

In testing, there were numerous drawbacks that required correction and many alterations that had to be made to the vehicle's design. It was decided to begin serial production of the new vehicle and the vehicle officially entered service in April 1946. It would go into production in Nizhny Tagil in 1947 and Kharkiv in 1948.

Reference:

Sadly I'm lacking some blueprint but i manage to obtain a T-34-85 blueprints, making the turret separately from the hull...and yeah it doesn't goes as plan...

No i don't use track mod, i stick to mobile friendly tag

Controls:
Pitch: move
Roll: turn
Yaw: turret rotation
Trim: gun elevation
Weapons:
1x D-10T Mod.1945 100mm gun
1x coaxial gun

You can remove the Gyro and switch to rotators if you want
(2 on the turret, 1 near the mantlet)