Your models remind me of some that I saw when I worked for the Federal Bureau of Prisons. Some where made of nuts and pipe pieces, all metal, and others where made of whatever they could get. These were often given to their young ones at home, or bartered and used as currency. Prison life creates it's own reality. I imagine remembering rides you've had must really be a great escape.
Below are some examples I found. Some prisons allow these to be auctioned at special craft fairs, and they can fetch quite a price, after all, they are all one off models. The last one is completely made out of paper. It sold for a very high price at auction.
A lot of people don't know that except for the 3 meals a day, which may be palatable or not, everything, or anything else you want, you have to buy. Making these models allows these guys to get an extra blanket, candy bars, a very long list, etc. You do the crime, you do the crime, but this kind of craft is a positive undertaking. IMHO

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