Thanks for the detailed explanation! I could now have an alpha background to the rendered image, although there is some slight differences on the overall results, see here
https://x.com/ernesernesto/status/1798980072667591007
https://x.com/ernesernesto/status/1799294301941453300
the dirty stitches I think is the really selling point from the first result, it got lost when I tried making the background transparent with your steps, this is with only the canvas noodle removed
https://x.com/ernesernesto/status/1799299020684488773
anyway, thanks again for the quick reply! This was really cool! now if this is can be used with a batch export or even better rendered in real time... this would be way more interesting :)