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I’ve found a dirty hack to hide the menu bar in Mavericks while the Quartz Composer viewer is in fullscreen on an external display:
1. Right click on Quartz Composer app -> show package contents
2. In the Contents folder, right click on Info.plist -> Open With/Other… and choose TextEdit.
3. At the end of the file, right before </dict> add the following:
<key>LSUIPresentationMode</key>
<integer>4</integer>
It should look like in the image:

QC Info.plist
4. Save and restart QC.
The menu bar is gone, but if you mouse over the top of the screen, it pops up.

:)