OMG I am so excited y'all want to knit him, I knit about 10 of them for co-workers a few months ago! I am a turtle freak, I even have a pet Russian Tortoise named Boris Gustav Stravinski...I mean he is Russian after all
I found that mercerized cotton worked very very well for Sheldon! I even put dread locks on one for my co-worker who was in love with Jason Castro on American Idol! He is also a very quick project only took me at most a week of knitting to complete one and that's with only knitting for 1-2 hours a night.
Tip: I started with the shell pieces and put them together then the legs then the body placing the stuffed body into the shell for leg placement. They were a huge hit!!