wget works OK, but isn't ideal for incremental use because SMF appends the current PHP session ID to some URLs, which then makes some common files look unique every time wget is executed.
But, for now, I grabbed the ten most recent pages, then started it on the full thread. In order not to hit the server too much, I have it wait a couple seconds between fetches. Unfortunately, wget doesn't have an option to wait only between fetches to the same domain, which would be faster since not all elements on a page are from eevblog. At least it supports modification timestamps to avoid re-downloading files that haven't changed.
Anyway, it's been chugging along for a couple of hours and will be done in another 16 or so hours (all pages of the thread with all their requisite elements).