Road, if there was such an online reference - and there may be - the first question would be whether ''extended cruising'' as they define it fits how you define it. ''Cruising'' is a terribly abused term, here & elsewhere, and almost means something different for every one of us.
But where does that leave someone who wants to know about basic outfitting needs? Not that it''s your only option, but a suggestion I''d offer is to pick up a few books written in the 70''s or early 80''s and that coach the reader on prepping a boat for offshore sailing. These almost inevitably will direct the reader to the truly important, basic boat issues because there simply weren''t lots of systems to distract one back then. Here are a few examples, all of which are dirt cheap now and all applicable to your question:
After 50,000 Miles by Hal Roth
The Cruising Life by Ross Norgrove
Log of the Mahina by John Neal - a ''cruising story'' of a 27'' Vega, sailed by a young fellow deep into the So Pacific and back to Seattle; the appendix talks about outfitting a small boat for a big trip
Mahina Tiarre, Pacific Passages by John Neal - another ''cruising chronicle'' of a 31'' sloop and again with a practical appendix on outfitting a small boat
The minute you get past the basics (things like reliable self-steering, all-weather
rig & sails, functional layout, seaworthy hull form, unquestioned rudder & steering integrity, strong & suitable
anchor handling gear, and practical navigation capability), there is a lot of subjectivity in choices that often are a function of one''s pocketbook more than the demands of the passage.
Jack