I do have a half-built Elephant with the giant mortar from the SturmTiger fitted. open rear superstructure so you can see the missile stowage. Really must finish it
I do hope you finish that some time soon. I had a similar idea for a PanzerHaubitze 2000 and the SturmTiger rocket gun replacing the 155mm gun barrel. Decided to abandon the idea and gave the SturmTiger bits to General Zod years ago. No telling what landfill the parts are hiding in now.