I didn't read any of the tutorials or watch the video and I've never done anything like this, so if this has been addressed, forgive me.
My first thought is that using fusibles on acrylic might be a bad idea - wouldn't it melt? I know there's something that knitters do called "killing" the acrylic with heat to make the knitted fabric less stretchy and drape better (I think. I don't knit, it's just something that I read.)
It seems that applying enough heat to actually fuse something might ruin it.
But if I'm talking through my hat...never mind!
ETA: Ok...I went back and looked at the tutorials - they were using wool, not acrylic, sweaters to make their blankets.