The issue is the pieces don't work together and there is not an Alt (or flip) of the ceiling. The ceiling seems to only work with the Right Start curved stairs and I haven't figured out any way of placement to have it work with the Left Start stairs.

Current work around is just to use the four individual ceiling pieces, but it just looks bad compared to the single ceiling piece.

Am I missing something on how to flip the piece ("e" does nothing)? Is the Alt piece coming soon? Any help or confirmation is appreciated.
Many Thanks.