Looks good Neil. I look forward to seeing some more detailed photos when possible. The wonderful thing about junk rig is that, even though cambered sails may perform better in light winds, the rig is inherently both low stress and low tech and happily tolerates cheaper, simpler solutions. I am reading and writing a profile on Donald Ridler and Erik the Red at the moment for the JRA Hall of Fame, and marvelling at his cheap cotton 'bedsheet' sails that took him across the Atlantic. Your polytarp sails are high-tech by comparison! Also, when they do tear or break down in the sun you can replace them very quickly and cheaply! It is a different approach to the more sophisticated cambered sail camp but equally valid.