Seating in the rear that would be non-invasive (and removable) could be as easy as coolers with seat cushions.
For a little more work, the transom could be boxed in similar to the photo below, and a folding seat (think Birdsall Marine) could be added.
Parker actually offers a folding rear seat on the newer boats.
Building an anchor locker is possible depending on your fabrication and fiberglass skills.
What I would envision would be to box in the bow (about the size of that cooler) and put an anchor roller on there.
Store the anchor on the bow in the roller and the rode in the newly fabricated chain locker.
Take a look in the Projects area for people with more fab skill than I have, and see what they have done.