I like your "kalibiner". The overhand knot in the middle, makes a regular overhand knot at the end secure-cool. The last photo in wide-angle, has excellent artistic merit. Well done, friend.
I am glad that you had your fingers crosses, as there are several potential failure points in your suspension on either side of the kalibiner. It reminds me of when I was in highscool. I suspended my box springs and mattress from the cieling with eye hooks and clothes line. I enclosed the space with a hippie tapestry. It worked fine...until it fell down. Nobody was hurt