I can't actually see this picture, but I think I can answer your question:
If you need to create blueprint background drawings, you need to create the images in a graphics program (such as photoshop, paintshop pro, etc.) where you can trim the views exactly to the very extents of noses, wingtips and tail/rudder edges, and set the graphics pixel width x heights to the exact corresponding size (while CONSTRAINING dimensions!!!). Then they will work as you want in AC3D.
By the way, it's usually only necessary to know 2 dimensions of the object. By constraining and knowing any 1 dimension, you will maintain proper proportion with a 2D drawing.
z.b. I often work with aircraft, where I know very specific data on length and wingspan, but height is a little "questionable" because I don't know if it's height with gear deployed or gear up. No problem. When I size the graphic for the Left view, I know for SURE the length of the aircraft. So I make sure the picture is cropped perfectly from nose to tail, use the same pixel length for the graphics in Left, Top and Side views, and the proportions work out.
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