Suggested additions to building pieces:
1) "With Glass" variant of the three-corridor "Multi-Connector" piece, with a window mounted in the long wall segment
2) "Half-Glass" variants of all corridor pieces with the upper half of the pieces entirely glass, aside from some minor structural support visible, like a couple of thin metal arches. Would be a reasonable candidate to maybe use the new aerogel and aluminum-titanium products from the chemistry tree.
I suggest the latter as a higher-visibility alternative to the current windowed corridor types, as the window positions combined with the player's camera position when standing mean that one has to crouch to see very far out the windows, or to see out at an upwards angle at all (no sky views while standing).