Mission Architect, Issue 14 of CoX, is now live, and I have been dabbling away! It's great fun.
So far I've created two villain groups; one based on my dad's villain character, and another based entirely on robotic powersuits to give my character some backstory. The powersuits are far better and more complete at the minute, and I have one mission with them in published already. Be warned; we could easily make cake missions for fast levelling, but if you do it properly (which is far more fun), you end up with SIGNIFICANTLY harder baddies than the regular game provides. It's awesome.
Anyway, just thought it was worth a mention!