You've done the bonsai world a great service by drastically chopping your S-curve mallsai Chinese elm. The biggest challenge you face right now is getting it through the Idaho winter. Expect it to pout indoors. Give as much light and humidity as you can. Chinese elms are tough customers, so hopefully it'll come through fine.
Now, the next challenge you face is the need for vigorous growth. You won't get much of that in a shallow bonsai pot, so you might want to consider putting it into an oversized nursery pot and letting it grow out for a while. At some point or other you'll see a promising new leader and you can chop to it and regrow the whole tree.
Good luck with your project!