Actually they can be had for quite a bit less if you're willing to eschew the walnut panels and Acoustic Sounds pricing.
Here's the quarter-inch two track for $5000:
https://vintageking.com/mara-machines-mci-jh110c-1-4-two-track
And the half-inch two-track for $7250:
https://vintageking.com/mara-machines-mci-jh110-1-2-two-track
Chris Mara is a great guy, a talented recording engineer, equipment restoration guy, and most of all, a savvy entrepreneur. I've attended one of his "tape camp" weekends and enjoyed it immensely while learning a lot. He knows his stuff. His most famous build is a 2-inch, 8 track MCI for Pete Townsend, using a set of John French's "Ultimate Analog" 2-inch, 8 channel heads. You can read about those, here:
https://www.jrfmagnetics.com/ John lived in Nashville for quite a long time before moving to New Jersey.
As Nando alludes, my own coulda-shoulda-woulda MCI moment came when he alerted me to a quarter-inch stereo MCI that the good folks at Innovative Audio took in. This was what, eight or ten years ago or so before prices for pro gear had gone crazy? Anyway, IIRC, Gordon wasn't quite sure what to do with this beast, I was in the middle of trying to prove to UTC that a joint music technology/oral history academic program with a recording studio was viable, and Nando alerted me to what I seem to remember as a $100-ish price (correct me if I'm wrong here, Nando) for this deck. And it was, as usual for the gang at IA, in pristine shape. I didn't have a truck at the time and couldn't muster the funds to get a friend with a truck to drive out to BC with me and drag this thing back home. I continue to regret that decision almost as much as the one to sell my Counterpoint SA-5000 preamp and SA-220 power amp.