Soviet AT(?) bunker, Aug 27th 1941.

This is mostly likely an artillery semicaponier #1006 in Svetogorsk (Enso), armed with two 76mm L-17 guns (fortification version of the L-11 tank gun, which was installed on early T-34s and KVs):

Soviet AT(?) bunker, Aug 27th 1941.

The wehraboo'ism is strong with this one.

It can have it’s top speed of 8mph and be a slow moving pillbox until an IL-2 ends it

Depends on who you are asking. According to an English report, "senior engineer and electrical specialist, Otto Zadnik told an independent observer - one of those present when earlier vehicles were examined - that the performance of the Maus was equal to that of the Panther. The Maus was very easy to handle and had enormous tractive power, for it was able to negotiate gradients up to 39 degrees."
This statement was also backed up by Ferry Porsche's memoirs "the engineers involved in the trials and even neutral observers were convinced the Maus was no way inferior to the Tiger in terms of maneuverability... My father himself drove the Maus a number of times and thoroughly satisfied with the 20 kph (12.4. mph) capability of this quick design."

But yes, Kummersdorf would make a fun map with 1st Ukrainian Front vs. the Maus 205/02, Volkssturm and some elements from the PzKp Kummersdorf. One of those funnies was supposedly the immobile test version of VK.45.02 (P) - https://fhsw.fandom.com/wiki/Panzerkampfwagen_Tiger_P2_(VK_4502_(P)_Ausf._B)

The topic has been recently revised in Michael Fröhlich's brand new book; "Der anderer Tiger".

I also want to see it 2:1