Well good luck on that then.Russes dont really fit for fortressess though i think.It has a clearly defined shape of a tank.
By that i mean it doesnt really have any space where to add room for your boyz.A land raider for example not only has the insides,but can easily be built upwards.Chimera?Same thing.
Although i would be interested how you would pull that off  
 Why not just make it a stormsword with space in it? ROFL WAFFLE