A lovely little model kit from Dragon. It fitted together like a dream, the casement shell is actually metal not plastic, as were a few of its fittings. Beautifully precision made, but not cheap. Dragon will sell you an already painted version in their die-cast series.
Front: A splendid view of the 35cm (Modified KM depth charge) Rocker dispenser. Rate of Fire is not an issue, it was sufficient just one of these things "went off". Heavily armoured to be able to trundle into position and survive to get off its first shot (and probably last one needed). A very direct fire weapon.
The Side: Notice the reloading hatch in the top of the casement and crane/winch required to manhandle the next round into the SturmTiger.
The Back: The site you probably want to see if you are interested in knocking one of these things out!
When exactly you would use it on the wargame table is another question entirely. It was a post-Stalingrad reaction to urban fighting. I believe units could have fought in Warsaw (1944), but most seemed to have surrendered to advancing US troop in 1945 on the Ruhr. Quite what the US troops made of the beast is another matter.