That is a Winged elm I believe, not a Corker... They make fine Bonsai, but get those cardboard looking wings on them when the branches grow vigorously, and it seems that scars can develop something around the callousing that looks similar to the material the wings are made out of, producing big bulges where damage occurred! Only happens on some of mine...
Besides all that mess, they do make fine twiggy branches, nice smooth grey bark on old wood... Larger leaves than Chinese a Elm but the leaves do reduce well... seem really tough, and are completely cold hardy where I live. Literally grow like weeds around here.
Mine are a little skittish about being collected! Lost branches and the whole top of a small tree before during collection and the one that I got the most roots for had the worst damage... Odd.