I plan to add a removable leeboard and mast partner, as well as a sail in the 20-25 square foot range. Maybe something like the Hobie kayak sails or Mik Storer's drop-in sailing rig.
This boat should fill a gap in between my kayak and outrigger canoe. Something I can setup and sail quickly in the evenings after work this summer. Provided I manage to finish it before then. I'm not in a hurry.