My design wall is the entire wall next to my sewing machine it’s about 7.5 ft high x 14ft wide. I use insulation board covered with batting. I could not quilt without a design board as all my quilts are at least twin size and larger. I like having my wall next to my sewing machine as I place blocks on the board as they are finished. I have rearranged my sewing room at least 3 times before I found a configuration that worked for me. Congratulations on your new home and new sewing space!