Troll "Uhyret"

A design submited to the Army by Troll, inspired by the grand siege mortars of the Great War. Just as Soviet and German engineers, the deigners at Troll Bilindustri had the idea to put a large caliber weapon on a large tracked platform creating a self-proppeled siege mortar capable of cracking fortifications and destroying natural obstacles.
When the damaged turret of the HNoMS Haakon VII was salvaged the 3 203mm guns where in storage. This is when Mattis Jaur of the Otto og Mattis Design company saw this as an oppertunity to create a siege mortar tank. With this idea in mind they came up with the Troll "Uhyret". Impractical and cursed by design this behemoth served with destinction on the Swedish front, being used to destroy the fortifications along the border as after German forces had been expelled from Østlandet by a joint Franco-Norwego offensive.