I am making a quilt for DH, I fussy cut blocks and framed them in different colors and would like to set them in a black background. They are all different sizes though. I am thinking I need to break the top down and make it three columns. To get the blocks to be the same size I was thinking of adding the black around all of them and then triming them all to the same size and them add more black as sashing. Is that the right way to go about this? Thank you.