I’m pretty sure the top piece is by North American master illustrator M. Alvarez because he/she signed it. I think the bottom is by the same hand. What are we looking at? It’s a space station, but you knew that. You now know as much as I do. Parked here only because it shares the same page in Flying the Space Shuttles as the 1982 concept by Ted Brown I shared earlier.
Flying the Space Shuttles Don Dwiggins Dodd, Mead & Co., 1985