I’ve undetaken many such projects. “RasPrint” was making a CUPS server with an RPi Zero for a decade-old printer to add features. It meant spending £20 to get Google Print compatability without throwing away a perfectly good printer. “PiFi” used another RPi machine as a web-enabled, phone controllable Hi-Fi before Google Home or Amazon Echo existed. Then there were others like “FrankenNAS”, turning my EeePC into a NAS when it wasn’t useful as a laptop, before eventually gutting the whole thing and putting it on a shoebox to aid with cooling after removing the fan.
Each of these things were opportunities at the time. They were also relatively inexpensive and were chances to learn (mostly about linux) while making something cool or useful, or both if I was lucky. As I have become more ambitious with my projects, so have the costs involved. This one is a doozy; it would be a labour of love moreso than a simple project, not to mention probably taking most of the year to afford and build.