I'm working on my jelly roll quilt now and what I like is you can make it any size you want You say you want it 36 x40 so make it 40 x 40 and then cut it down to 36 and you already have strips that you can cut down for a 9 patch for a doll quilt or whatever you may need it for. There would be a use for the part cutoff somewhere down the line. Just a thought