Walter has just posted his ScriptCraft code to GitHub. This Minecraft mod lets you create buildings etc using only Javascript. Very very cool indeed. I’ll be trying it out later with some of the kids. My Minecraft experience is minimal so I’ll let them guide me.
He has included an example cottage script which should be a good starting point for a lot of people.
Go Fork and Prosper 
Let me know if you have trouble installing the mod. Am really excited about this. I’ve tried to make the accompanying Drone module as fluent as possible so that Drone commands ( up, left, fwd, back, turn, box, sign, door, box0 ) can be chained together so that kids can try stuff out at the in-game command line too.
Thanks Walter. Our eldest has installed mods before but hasn’t done one this complex so I’ll give it a lash shortly.