Both my crwths were made by master harp maker Tim Hobrough in 1983 & 1987, not sure if he's still doing them, but they're both still going strong, though I've retired the round crwth from performance.

round: http://www.youtube.com/watch?v=R_t0Vm7Gjrs

square: http://www.youtube.com/watch?v=RTQGXIu5QHA

In the intervening years there's been something of crwth revival in Wales which might be worth a look to see who's making what, though I doubt you'd find any frets in there, or curved bridges for that matter - let alone machine heads!