Im going to compare my Russ redesign, the Vangaurd, to yours.
I designed it to be more feasible then the current
LRBT design. dropping the rhomboid tracks for more compact design which shortened the vehciles siloete overall. its turret is enlarged and elongated to the point you can imagine squishing in 3 people (the guardsmen models) into it with a commander at the far back, gunner on the left and loader on the right (or vice versa), both of which have their own hatchs on the sides of the turret.
The Driver sits infront of the engine with a massive plate of metal infront of him.
That and the gun is much much smaller and more like the 120mm the
LR is supposed to have (not 200 or 300mm).
It has the lascannon in the right side of the hull. Bolter sponsons could be attached alongside heavy skirt armor if needed.
I think my version. THe Vanguard is more practical due to having some mechanical knowledge of tanks put into it. it may be just as fictional as the Russ itself but I like my Vangaurds design.
Note: the picture of the vanguard is an early unpainted version. upon request ill go retrieve my other Vangaurd pictures (or you can look through my gallery)
Compared to yours its like comparing a Panther or Panzer 4 to an M3 Lee. in terms of physical design anyways (not performance, that's another story).
Perhaps yours could have a Demolisher cannon in the lower sponson while having the Battle Cannon in the turret.
Sort of a "Baby Baneblade" only missing its heavy sponsons.