Can't say that I have... kinda' hope that one doesn't catch on. I have done a few conversions, of [some-might-say] an upcycling outcome.
At least two rather inexpensive archtop guitars got turned into a mandocello and octave mandolin. I converted a budget Regal resonator guitar to an 8-string once. We upgraded the cone and spider too. Well, all the guts really... tailpiece, nut, tuners. Pretty much took the husk and used it as the chassis for a build.
Too many banjos to remember.
But nope... never thought about a DIY harp guitar.
