Well it's done. This one had extra material all around it from the bottom so I just met the edge to edge and then turned it over once. I wiggled the corners into place and no they are not any where near perfect but I think my Grandson won't mind.
It ended up being 58" by 35" It will be a nice blanket to cuddle on the couch with.
I tried using a blanket stitch but after one short end I went to a regular straight stitch. :)