I should note that followed that Christopher Gutteridge <cjg@ecs.soton.ac.uk> followed that response with a note
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But that's me making a reasonable guess and getting on with it.
The EPrints document is a URI which represents a conceptual document which consists of a number of actual files, eg. HTML+JPG+CSS, so the dct:hasPart makes sense there. The main issue is how to relate the document to the metadata record, and you rapidly decend into FRBR hell.
Until a few people have consumed my data I consider it very much a work in progress!
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I will summarize the future messages on this thread.