Jay,
Well, I've no photo, but the bonsai-potted brother of this elm is a shohin broom in the making. While this yard-grown one is 4" trunk and 8" nebari, the potted one (same age) is 3/4" trunk and 2.5" nebari. Yes, quite a difference.
Jonny,
Glad to hear that you've got a similar project in the works. I suggest chopping the trunk this coming spring and letting it stay in the ground for at least another year. This way, you get the rampant growth to help heal the wound and grow the strong primary branches (which you'll cut back strongly) before you put it into a training pot. Once you get it into a pot, the growth will be cut by half or more.
Best of luck!
kind regards,
Andy Rutledge
www.andyrutledge.com/
zone 8, Texas