If you want fire power for the faction Empire, then here it is (see the link)! https://steamcommunity.com/sharedfiles/filedetails/?id=2856565527
But this is a Regiment of Renown and if your (Legendary) Lord has rank 30, then you have this massive giant cannon for your army!
And if you want the other Hellhammer Cannon for the Empire, there is also a link by this mod.
Good luck with this mod and lots of FIRE POWER!
For the Empire Reikland! Long live Emperor Karl Franz!