Hollow body, chambered, thinline, et al; the delineations between all those things can get a little loosey-goosey. The Mooncaster is listed as a hollow carved top, but it's not a true hollow body in the sense that a Gretsch is. But it is also definitely more than simply "chambered" or "thinline".
The entire body core is cut from a single piece of wood, and the wings are completely hollowed out. Then the top is glued on.
When Ken Warmoth was developing the Mooncaster, he actually purchased a custom shop Gibson 339, because they are made the same way. It's still sitting in the Warmoth headquarters, nearly untouched for 15 years. I've been scheming about how to "permanently borrow" it for that entire time. Creative suggestions are welcomed.