Ray,
I added the session dump to the confirm.php and verified that the shipping dimensions are being passed along as you can see in the private message area. It seems that no matter what shipping dimensions I use, the weight variable seems to be the only thing that effects the shipping calculation.
As for the misspelled item, Legnth instead of Length, it is misspelled throughout the entire website, including the database field also named Legnth. The misspelling is not affecting the correct length data being added to eCart.
Thank you,
Robert