What Karen said is so important! I did a queen quilt, and had just enough backing for it, (so I thought), thought I cut straight and laid it out straight, but ended up with a part of the top that had no backing behind it. A little patch here, a little patch there, nobody will ever know! It is always wise to cut your backing bigger than the top, then if things shift a bit, you don't have to make a patch like I had to.

The website looks interesting, but I guess they took that link down, some of the other projects look interesting, though!