An undefined need for more payload bay volume inspired the thought that the lee side area above the payload bay (at entry angles of attack) could be used for an expanded bay. This resulted in what was called the “humpback” orbiter.
source.image: Hazegrayart
The wind shield area was faired into the higher moldline and whole faired into the vertical fin trailing edge. There was no change in the hypersonic aerodynamic characteristics at high angles of attack. However, there was no evaluation of the subsonic aerodynamic characteristics but it is likely that there some degradation of directional stability.
STS External Tank Station
In 1980, NASA conducted a study on various concepts for an American manned space station, focusing on the ‘wet workshop’ approach. This concept involved using the large External Tank carried into orbit by each shuttle flight to create a spacious space station.
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Although the idea was highly cost-effective and practical, NASA management ultimately did not pursue it seriously. The proposal was viewed as a tempting low-cost alternative to their own ambitious plans for a large modular space station.