I wanted to point to this topic, as well as DIY ribboncontroller in response.
In a lot of ways, I think Artiphon Chorda, Chorda - Wikipedia , when used as a MIDI controller, is very much like the CS80 Ribbon, but on the other hand, I’ve never played an actual CS80.
And of course a lot would depend on what you want to DIY, and what you want to buy, and what you just want.
edit: oops - Google Search on chorda+artiphon , wikipedia is for the marine algae, which though interesting, doesn’t seem particularly relevant.