I've worked on big, custom gantry machines like a CMS Poseidon that were in the low 8 figures. It was purpose-built for milling and inspecting composite nose cones and rotor blades for military aircraft.
Anything with "inspecting" or "composite" or "military" or "aircraft" doubles the price, so you can imagine what happens when you combine all four!
A couple years ago we did a project for a division of Kurt (the vise guys) and they gave me a tour of their contract manufacturing floor. The toolchangers on some of their machines were themselves larger than some horizontal machining centers. Didn't ask, but those machines had to be staggeringly expensive.
Anything with "inspecting" or "composite" or "military" or "aircraft" doubles the price, so you can imagine what happens when you combine all four!