Great work, Tim. How you "see" the alternative uses for many Playmobil bits I don't know.
I like the refinements you've made for connecting your cutting gear to the compressor, and the redesign of the compessor itself.
The hand pumps I especially like because, as well as being realistic, they also are low-tech, something which is often neglected nowadays in favour of the all-singing, all-dancing approach. Low-tech is cheaper, more compact and in many/most cases does all high-tech will do.