Slightly OT: tips for fabricating with plexiglass?

[Computer Collector Newsletter]

It's only "slightly" off-topic because what I'm building is a new case for my
Apple 1 "Replica 1" board.

I've heard some horror stories about whole (expensive!) sheets of plexiglass
simply breaking in half when incorrectly drilled through.  The guy at the
plastic supply company tried selling me a special drill bit, but I'm hesitant
about that.  Does anyone has hands-on experience and tips (vs. just
speculation) about working with this stuff?  This computer will be on display
as some public events, so the final appearance is very important.

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