I ended up emailing them because I hadn't heard anything. They were just finishing up a run of the G12Cs in 16 ohms, so it should ship Monday. I also figured out how to remove the grill cloth because the speaker screws in in the front. Turns out it's held on by four pieces of velcro in the corners.

I've also learned that the bias on these are fixed and not adjustable. They are biased cold from the factory so if I wanted to switch out power tubes I could. Going to try the speaker first, then maybe preamp t00bs. I'll swap out the ones from my Jet City to try it. One thing at a time.