I am taking apart my old phone system. Electronic stuff often has neat little bits inside that can work for wargame scenery, walls, and even as old computers.
Each handset has a speaker inside. The Germans in WWII tried to make weapons out of loudspeakers. Might be a wargame project in there for WWWII.
New 1/72nd Caesar Miniatures WWII Germans.
When looking for Pulp ideas, old magazines are a great source of ideas. The giant battleship bicycle is certainly not something that springs immediately to mind. That would have required the entire steel and rubber production of the United States from 1916 just to build one. Compare it to the buildings and troops in the front. Makes the Maus look rather anemic in comparison.