The above picture is a 'detailed' look at the facade for the Bean Can Hab. The main vertical and horizontal structural members can be clearly seen. The metal ridges that support the glass can also be seen, covered with cushioning at the edge. The panels are then placed on the cushioning.
When a panel needs to be replaced, a seal (temporary panel behind glass, made of steel) is put against the main structural members on the inside (with cushioning if necessary). The original panel is then removed from the outside (possibly shattered). Since the panels are smaller than the area between the frames, a new panel can be brought through the outer frame on an angle. The panel can them be moved into place and held there while the inside steel seal is removed. A plug may be removed from the steel panel allowing pressurized atmosphere to enter between the clear panel and temporary seal. The new panel would be locked into place by the pressure, and the temporary steel panel could be easily removed.
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