Well, the bus museum idea sounds absurd, I know, but it
could possibly be done; in New York, a disused subway
station was turned into a subway museum complete with exhibits of
the subway cars themselves on what used to be the platform.
If you guys think there's no such thing as a disused bus
interchange or terminal in Singapore, then I urge you to think
about Hougang South - yes, it's car parking space now, but they
could possibly shift it underground and reuse the space as a bus
museum.
I know this is a crazy suggestion that might not become reality,
but I have decided to post this idea anyway; maybe, just maybe,
someone might see this and push for this idea to become reality.
Who knows.
OT: Well i went to the subway museum when i was in new york,
there were two trains there and both still were in working order. I
believe it can be done in singapore too.