hey, my students and I got the frame up a couple of weeks ago. I did put a bit of a gap at the teazle shoulder(3/16) and did not wedge the dovetails. there is a photo of the frame here:
http://www.wpltree.ca/tools.html
that would be me laying out the ridge.
thanks again to all who added to this thread, and I encourage anyone interested to cut the english tie joint... it is a good teacher.