> does antora help me get easier access to copy / tabbed sources or do I have to do that manually/on my own too here

I developed extensions for Couchbase that do both of these things. See https://github.com/couchbase/docs-site/blob/master/lib/tabs-block.js and https://github.com/couchbase/docs-ui-sandbox/blob/master/src/js/07-copy-to-clipboard.js.

> definitely one of the better antora sites I've seen

There are a plethora of Antora sites that look amazing. Many of them are listed here: https://gitlab.com/antora/antora.org/-/issues/20

> No they are not complex; but they are there without extra setup.

But they are with extra setup because what you're asking to do is to create something that doesn't exist. I think you need to rethink your rationale. And that would be to either use Jekyll AsciiDoc and rework the extension in Ruby or use Antora (and borrow extensions from the places I cited).

Best Regards,

-Dan