Kind of a really big Mirage, my Dad always said. I've seen them up close as well, and they are small. Sort of like a Vulcan. The engineers fought like hell not to have windows, but couldn't sell it to the owners.
There was a really nice magazine article several years back with what-if liveries for all of the airlines that expressed interest. I'll try to find it. G-BOAD had Singapore Airlines on the port and BA on the starboard in 1980, kind of cool.