Gringo:
If you go to my original posting The ultimate Tandem Island (hydrofoils,spinnaker,jib,etc)
viewtopic.php?f=69&t=33720It goes into great detail on how to make a furlable mast topper, and a bra on the bow to support the jib (if you don't want to use the lift cleat).
Before making my own jib (a little larger), I used a standard Hobie Kayak sail for the jib for a while.
The roto furler is the one that Halibu77 made and posted on Youtube.
Been using everything for over a year now without any problems.
You shouldn't need to make any modifications to the boat itself.
Hope this helps
Bob
Hope this helps
Bob