Well, firstly If I can sergest posting in the sewing/ fursuting section might have been a better choice,
but its okay.
As for the patten, I have made a squirrel plush before I would sergest using a normal bear patten and just edit the head, legs and tail slightly to fit a squirrel.
Or if its more help, I can draw you a patten.
Let me know,
Your folfy
Chaz