Welcome Andy,
those sound like fascinating projects! I'd love to see progress photos and the finished articles. There are many great customisers here on Playmofriends, though my own efforts are currently very limited.
If you can get to a craft shop to look at fmaterials, people have had success with various fabrics to replace sails, and a slight stiffness to the fabric makes it hang better.
Take a look at some of the convention photos in various threads and you'll see that not only are you not alone, you're quite restrained in your collecting!
cheers, Martin