Slightly OT: tips for fabricating with plexiglass?

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. ===== Tell your friends about the Computer Collector Newsletter! -- It's free and we'll never send spam or share your email address -- Publishing every Monday(-ish), ask about writing for us -- Mainframes to videogames, hardware and software, we cover it all -- W: http://news.computercollector.com E: news(a)computercollector.com -- 653 readers and counting!