An update to my trying to modify the boxy cardigan pattern to add a hood. I've added and ripped out two hoods so far. Neither looked right in their shaping or number of stitches but think I found the solution. I decided to add a button hold band instead of adding a zipper and I finally found a pattern at Chic Knits that has a hood that I can adapt (decreasing the number of stitches) to accomodate the smaller size of the sweater I'm making.
Hopefully I'll have a picture to post soon!
Thanks again, Jane100