Some tips on that operation at this link:

http://www.dewalt.com/us/articles/ar...working&ID=511
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itself is 3/4" thick (both pieces), so is the dovetail going to
simply
snap off when I put a heavy music book on it?

I guess the second question would be fitting it together with glue in the
joint without it binding or cracking. I figure epoxy will give me the
time to slide everything together (27" long), but I'm looking for any
advice as I only want to do it once

If my description isn't clear, I'll post a quick rendering of what I have
in mind.

TIA
Steve