While things have changed for ring slings in the regulatory sphere, all my custom-sewn slings have passed the sling standard, and the clearance section, having been sewn before the standard took effect, is exempt.
Current turnaround time: 2-3 business days (due to water sling BOGO 50% off sale)
I'm a geek! If you're a geek, too, perhaps one of these is up your fandom alley? If not, let me know and I'll see about adding yours!