I would say that the instrument SIG is definitely still active. While we do not have a current instrument making class going on in our shop, we do have our banjo playing instruction and jamming sessions at the shop twice a month. Other instrument players, besides just banjos are certainly welcome to join us for our jam sessions. If you are interested just email me at email@example.com and i will add you to the list for notifications of upcoming jam sessions.
I see that Bill Stirling is offering a guitar making class, so the instrument SIG must not be dormant. Also, I have been asked by some folks if we are ever going to offer another banjo building class. I hope we do.