While making the research (grandiloquent term for a rapid reading of some old Google books) for Bunzlau, I noted in the narratives of the combat the important role played by a small wood bridge 'dominated by a watermill' and connecting the right bank to an island. Afterwards, when searching for an old map of the area, I arrived to this Polish Map Repository site from which I downloaded the below map of the Bunzlau/Bolesławiec area in 1943.
Immediately, the wargamer in me had the old feeling: 'I must to build a watermill', so I started a frenetic google search by using the terms "watermill" and "wassermühle". You can see below some of my findings, including both real and model items:
water mill located in Rheda (Germany) was my final inspiration
To be continued!