Hi Don,
First let me congratulate you on getting this project done. I don't know what your experience level is. That said though, you have accomplished a challenging procedure. From the pics the binding looks good, and you got the whole thing put back together and ready to ride.
As to be expected- Keith has pegged it. Their is not much to add. It's to bad we can't see his hands here.
Here is a pic of a ground seat without the hand hole cut out yet. Things to note are the smooth transitions in all the curves, the flattish area forward of the cantle for the riders pin bones to sit on (this area is really important, note how far forward it extends. Thats what Keith is talking about to aid the riders balance in the seat), and how the main curve from cantle to base of fork is a continuous and gentle curve, with no abrupt changes bumps or humps. Getting the strainer prepped is important to all of this, but the real work is in the sculpting of the leather pieces that go on top. What ever kind of tool you use to do this sculpting, it has to be surgically sharp and properly adjusted properly so that it won't gouge or chop unevenly. A good medium cut wood carvers rasp is nice for evening the whole job out as a final step in the carving, as it works like a carpenters plane to level the surface.
Hope this helps.
GA