If two generators have the same UTI, Quick Look uses the first one it finds in this search order. When Quick Look searches for a generator to use, it first looks for it in the bundle of the associated application and then in the standard file-system locations in the order given in the list above.
/System/Library/QuickLook -Apple-provided generators, accessible to all users of the system. /Library/QuickLook -third party generators, accessible to all users of the system. ~/Library/QuickLook -third party generators, accessible only to logged-in user. 
You can store a Quick Look generator in an application bundle (in MyApp.app/Contents/Library/QuickLook/ ) or in one of the standard file-system locations:
The display bundle draws the document in the document reader. Quick Look loads the appropriate display bundle (if necessary). The daemon returns the generator’s response to the consumer part of Quick Look. It forwards the preview request to the generator, which creates a preview and either returns it or tells the generator where to find it. Using the document’s content-type UTI, the daemon locates the appropriate generator and loads it if necessary. The Quick Look framework sees that the document format is not of a native type, so it forwards the message to the Quick Look daemon. The client (Finder) sends a message to the consumer part of Quick Look requesting a preview for the document. The following sequences of steps happens: The user next requests a preview for a document that is not of a Quick Look native type. 
According to Apple developer docs the system starts a quicklook daemon when it determines that the UTI is not a system-defined type and the looks for a generator: SketchUp just has to register the UTI for the appropriate files. I have an Entry Type with a field called Gallery with a handle of gallery.Actually, the quicklook system handles the whole process.
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