I think I've done it. I got all post content importing how I'd like. I've got view to redirect requests to old Wordpress post urls / categories / categories feeds to their new uuid based permalink. I can customize the site name. And I've added pagination to all of the public views.

Now all I have to do is actually make the switch!

Got image rewriting working so all posts will use the Tanzawa standard photo insert...and noticed a bug when I import images.

Photos taken with an iPhone rely on the exif data to indicate the proper orientation. However, I strip all exif data from photos when I save them for saving size and enhancing privacy....

No exif data to orient the image and vertical images appear sideways.  The solution is simple:  rotate the image before stripping / extracting the exif data. Thankfully the fix is simple.