I suppose you can make them any shape you want once they are opened up.
The stamp is from the dressers.
You need a lot of staples\pins when blocking tanned fur to get rid of any puckers that would have to be cut out and sewn otherwise.
I wouldn't use pins at all on an open boarded raw skin like a coon as they would likely pull out.I would nail it like a beaver with nails about 1-2 inches apart.
Bears are done open also,so do a raw coon the same as a bear.