I loved this idea and knew that I had to make it for my superhero boyfriend, even though Valentine's Day is many months from now :)
The only thing I did differently was reinforce the structure of the plush by using cereal box cardboard. I cut out the same pieces as the felt shapes used to sew it together, only a little smaller, and left them inside. I'm very happy with the result, though I wish I had used blanket stitch for the top, it probably would've come out cuter. No matter, he'll love it anyway.