It's a lot like making a lined pull-over blouse or vest, which can be tricky because you have to think backwards (if that makes any sense) while sewing the sections together, and then pull the whole thing through itself to get it right-side out.

My stash is fairly depleted at the moment -- the last cool fabric I bought went toward making a big cushion for Rocket Dog's crate -- so there's a fun trip to the fabric store coming on. :)