An Aero Spacelines artists concept circa February 1968 depicting a six-engine variant of their Super Guppy, modified to transport 747 components from the Wichita Kansas facility to the Everett Washington facility. While this didn’t come to pass, thirty years or so later Boeing did modify a 747 to carry 787 components.
One of the original selling points of the Space Station was that it would be useful as an assembly station and launch point for manned missions to the Moon and Mars. One such concept was the one illustrated below, a “dual keel” station concept from 1989 with a partially enclosed “hangar” below and an aeroshell-equipped Mars vehicle above.
This space station design features a wealth of electrical power, both from rectangular photovoltaic arrays and segmented-mirror solar dynamic generators.
NASA art, circa 1975, depicting the Space Transportation System. Apart from the paint job, this is pretty much as-flown, except for the fairing over the nose of the ET. This probably depicts the “de-orbit” solid rocket motor that early ET concepts showed, meant to make sure that the ET was properly dumped into the Indian Ocean.