Top ready to flatten...

The clamps come off! There's a lot of glue squeeze out, which I think is
good. I started in with the scrub plane and worked my way up to a #80 cabinet scraper. My triceps are now the size of Hulk Hogan's.

In hindsight I wish I had put a clamping caul across the top of the sections to keep the boards aligned vertically. Of course, I was using all the jigs I had, so I plane.