You're absolutely correct on the loose wire. I picked up some boards today to fasten the top and a few other places. We hadn't been leaving them alone yet. Thanks for your attention to detail!
As far as the step down nests, I built them today, but got too dark for pictures. I built them on half...
I'm in the process of adapting an old playset that I built 15 years ago for my little ones who are all grown up now...mostly. Anyway, still wanted to have the fun stuff available for the grandkids. Here's where I'm at...