We have that for another purpose as well. Depending on your needs, and trustworthyness (is that really a word) of your users, you might do what we did where we simply ask the user for the width and then height of the document. I modded so they make their entry in inches and then a simple conversion to metric takes hold. One issue you may hit is if you want your tif to center in the drawing. Depending on the complexity it might be as simple as cut, center page, paste. If not, there is a macro around the forums to center and maintain layers.
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