I don't believe Tom is planning any future updates to the CodeLab tool.
So, I took it and fixed a bunch of bugs/enhancement requests.
When I'm done putting in the stuff I want to do (I'm trying to figure out how to make it include an icon) I will publish my source code. If Tom wants to publish an "official" update incorporating some/all of my changes, he is free to do that. In the mean time, at least *I* will enjoy a better working CodeLab--and you can too, as I like to share.
Oh, and as I said in a previous post, my version says "Alpha 2" in the title bar of the code editor. Tom's only says "Alpha". So, it isn't too hard to tell them apart.