This is a Warhammer 40k Imperial Cruiser from Battlefleet Gothic.  It is an Imperial Overlord-class Battlecruiser (minus the dorsal Lance turrets).  Based on a 3d rendering by Andrea1969: (http://andrea1969.deviantart.com/art/Overlord-Imperial-Cruiser-10B-417761992).

This design was originally created on the Vespa creative server (s.vespamc.com).
Original Project Thread: http://vespamc.enjin.com/forum/m/20564518/viewthread/11940098-warhammer-40k-imperial-cruiser-creative

The ship is approximately 1/12 scale.  It has no interior.  It is made out of mostly stone and gray wool.  Feel free to give it the Warhammer paint treatment.  Unfortunately I don't have very good pictures of it.   Use Schemagic above to get a better view!

I would like to see more Warhammer 40k ships, so I am releasing the schematic to the public as inspiration.  Please provide credit if you upload a modified version of the ship.