Looks very interesting!
Is this a WW2 design? Looks very like a T-34/76 turret for the main gun, and BA-20 armoured car or T-37 amphibious tank
turrets for the MGs.
It must be truly enormous in 1/35 scale, if it's around the same size as a WW2 PT boat. If it's cast in resin (I'd assume so) it must be incredibly heavy, even if hollow-cast - I doubt motorisation would be possible.