I made one of these for my son’s room and it came out pretty good. I was pleasantly surprised at the resolution of image on the fabric.
A couple places to save $$ on this vs. what the tutorial says: use pine 1x4 instead of poplar-it costs about 3x less; use the Owens Corning stuff rather than the Roxul linked in the tutorial. Maybe a little less effective, I don’t know. I also altered the width on mine a bit to get the whole thing out of one 10’ board.