That's very clever! That's quite a collection of brass and copper! Though I would add one thing to the stock: a 5cm diameter pressure vessel containing some "power fluid" of sorts, if possible made with a copper pipe or if not a fence steel pipe with rounded caps. To justify the pipes and valves which look quite purposeful.
Your idea inspired me, but performing it was a bit disappointing

My ideas were often not in proportion, or they were in the way of other things.
Then I saw this oil dripper at our overseas friends ( only the delivery time took a very long time

)
but imo It fits well
Thank you for the advice.