All my fears were unfounded. The five original slings are all there, I was absolutely dumbstruck when I saw them. They are at least 8cm leg span on average and magnificently beautiful. They share the same nest, but the nest has several entrances. I know that the nest has increased in size, but I thought it was the one spider (which I saw regularly) doing all the webbing.
Now I know there is at least one female in the group as the exuvium I pulled was female. I'll be damned if I know which one the female is, but I don't care. There are sixteen M balfouri in the enclosure, and that is all that matters...
Most people are like clouds. The sun comes out when they f*ck off...