DAirbus is pretty much spot on. I have a Seattle PI
article on the mockup's move to Hiller in hard copy and am trying to find it online.
Just a couple of comments: the original 2707-100 mockup was life size and included moving swing wings, retractable flaps, and a furnished cabin with in-seat PTVs (hard to believe for 1966). A separate nose mockup had a simulator cockpit and a pivoting nose, and a third exhibit showed off the SST's GE4 turbojet engines and nacelle installation features. All were destroyed after Boeing switched to the 2707-300 fixed-wing design in late 1968. No one seems to know what happened to the mockups or where the remains went. They just disappeared.
The people standing around and under the mockup give a good sense of scale; this was to be an enormous aircraft.
Apparently for many years, a full-scale mural of the 2707-100 adorned the side of one of Boeing's buildings at BFI
. I'm not sure which one; the mockup was located in the Developmental Center at BFI
, which is where prototype assembly was scheduled to occur. Production likely would have been in Renton or perhaps BFI
The 2707-300 mockup was not quite as elaborate and was disassembled after the SST was cancelled in 1971. Boeing nearly sold it for scrap, but as mentioned, a buyer in Florida stepped in and saved it. The two SST prototypes were 15% completed when the SST was axed. Boeing employees kept some pieces as souveniers (occasionally bits of the 2707's titanium spars or skin panels come up on EBay) but no larger sections remain.
The Hiller Museum has the cockpit and the first 70 feet or so of the cabin, but I'm not sure if they saved the rest of the fuselage and wing. The structure was badly corroded, as you can see below, but had been restored nicely, according to later photos. I haven't been to Hiller myself, but I imagine it's worth a visit, since that mockup is basically all that's left of a nearly $10 billion program.
Lockheed's L-2000 mockup was located in Burbank. After Lockheed lost the SST competition, it was sent to a FAA facility in Oklahoma City and used for fire evacuation testing before being destroyed. Like the 2707-100 mockup, no trace of it remains. Lockheed wiped out almost all references to its SST program after it lost to Boeing.
Keynes is dead and we are living in his long run.