if you are looking for the frame of the same proportions Stan would have made a frame with a length of 15 inches and a width of 12 inches which is. my answer is based off lanes Jane's fraction 24/30 simplified to 4/5 (i divided by 6 to top and bottom, top is width and bottom is length) and compared it to 12/15 (or length of 15 and width of 12) which divides to 4/5 as well if you divide by three.
this shows that this frame is smaller but that it has the same proportions to Jane's frame.
