I haven't looked at the backing code in a while, but I really like the
public-inbox [1] approach to archival.  Since Gmane died, Git (and a
few other projects [2]) have also been using the author's hosted
version.  I haven't looked at the backing code in a while, but it's
live Perl, not a static site.  It uses Xapian for search (like
notmuch), but I was unable to talk Eric into using notmuch directly
because of our lack of Perl bindings [3].  Still, it's a pretty
similar idea, and it may be a good fit for you.  Previous discussion
on this list in [4,5].

Cheers,
Trevor

[1]: https://public-inbox.org/README.html
[2]: https://public-inbox.org/hosted.html
[3]: https://public-inbox.org/meta/20141027005553.GA10990@dcvr.yhbt.net/
[4]: id:20141107190321.GL23609@odin.tremily.us
[5]: id:20160820062931.GY30347@odin.tremily.us

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