BetterRed & eschwartz: thanks for the replies. I took some time to mull them over and experiment.
re: multiple URLS into ... comments-like custom column.
If calibre had a built-in URL column type (and live-link column entries to match) - that might be the least complicated functional extension to support relatively seamless access to a remote document. Currently, a custom column would not have live-links - and wouldn't offer much utility other than to indicate that a live link lies elsewhere (in the info pane, as BetterRed indicates).
re: empty book entries
When combined with BetterRed's suggested "URL in the info pane", a rudimentary functionality results: not very seamless - but it does work.
However, empty book entries are an important (conceptual) first step. Once the hard-wired association between a database entry and the local Calibre library (file set) is dispensed with, by evolution the entry can now point to remote files (via URLs), or even a remote Calibre library - providing for inter-library "loan" of the indicated document.
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