This looks awesome! I have a tapestry and a huge frame I happen to have that I might end up doing this with. Really helpful tip about the muslin backing!
Society 6, here's a link (it's 30% off today woohoo!) www.jdoqocy.com/click-8145682-12781067?url=https%3A%2F%2Fsociety6.com%2Fproduct%2Fminimal-abstract-art-landscape-8_tapestry