I'd do everything possible to get your money now. As far as I know, I'm still technically in queue but I have no confidence what I ordered would ever get built. I ordered Oct 2019 and was told a 6 month wait, gave deposit in April 2020, and finally asked for a refund of the $750 I put down in April 2021. He didn't reply to messages here, but did when I emailed the same address I Paypaled the deposit to. He refunded the money but he sent it as a purchase so I was out the fees for no good reason. I just let it go. I was told probably 10 times that he was actively building mine. At one point I asked specifically if it would be ready in a month since he'd told me a few times he was building it and it would be done soon, because I had an Aeolus I was selling, but wanted to keep it until I at least heard it with the Glen. He assured me it would be. That was August 2020. I've been following this thread and have read every post since Oct 2019. I don't recall a single person posting that they'd gotten their new Glenn in all that time. I don't know what's going on. Hopefully it's just wishful thinking on his part and he's telling himself that he is going to build all those ordered, but just being honest about not actually building anything for years now would be better for all.
Personally I'd advise anyone who has given him money to demand it back. My understanding was he doesn't ask for money until he starts building, but I and many others gave him money well before that in hopes that it would spur him to build them.
No judgment here, because you never know what someone is going through. But better safe than sorry to just get your money back. I've seen 3-4 used for sale in the past year, and got one of them myself. I'd be shocked if any more actually ever get built.