Leman russ battle tank redesign special versions

Few days ago I received a constructive critique about how modernize Imperial Guard's tanks in a more reasonable way. So I tried to link a more plausible design with the exaggerated style of warhammer 40000.

Some ideas for a troop transport and an orbital defense mobile point. I think the first could be useful for infantry regiments. The orbital gun is maybe poor practicable but good looking...in any case pretty vulnerable ad not able to engage low size opponents, so only spaceship or titan...It can fire with a full equipment of generators and sensors so not advised in direct fights with other ground armies. 

See the explode View of the tank (Interior)


See the other variants