Phase B is now complete!
The import from MT to WP went very quickly. The only ‘gotcha’ is that PHP hates importing text files of over 1MB (unless you screw with the php.ini settings), so I had to manually split the import.txt file into several smaller chunks.
As you can see, a few minor cosmetic glitches remain. I’m still not sure what’s up with the post title, but I’ll work on that later.