Jill, thank you! When I first started, I used picture tutorials on a site called "Rattributes" to figure out the basic construction of a flat hammock, tunnel, etc. Then I started connecting the dots and seeing how to make various different types from the same basic principles. Ferret hammocks are made in the same ways, just a bit larger, so I whipped up some for friends as a test run. They were actually the first things to prompt me to touch a sewing machine!