I went to view the quilt a couple of years ago. As I recall it is not that heavily quilted. I am pretty sure I remember that it was mostly ditched and echo quilted around the pieces of patchwork. Around 1/4" echo which is pretty standard for hand quilting. The museum website has one close up pic of the signature block in the corner and you can see by that picture that it wasn't quilted to heavily.
http://www.benningtonmuseum.org/stic...rch_highlight3