I've noticed recurring questions regarding how to figure out the math when changing the scale of a model. Here is a nearly brainless method for doing scale conversions, assuming that the starting point is a hardcopy and scanning is required. First step....when setting up the scanner, make the scanning resolution (pixels per inch or pixels per cm, whichever measurement system you are comfortable with) the same as the scale of the hardcopy model. For exampe, if the original scale is 1:200, set the scanning resolution to 200 dpi. Scan the images. Once you have the scans done, use your favorite image manipulation software to make printable pages. When you create your new pages, set the image resolution to equal the desired final scale. For example, if the desired scale is 1:400, set the new page resolution to 400. Downsizing is easy...when the new page is created, just paste the scanned page into the new page. If enlarging, you will have to cut the individual parts from the scanned image and paste them into the new pages.....and, for large parts, you may have to "cut" them into sections in order to get them to fit onto the new pages. Once you have a set of new images, print and start murdering paper. This technique works best with ship models, where the scale is usually in three digits. For airplanes and vehicles, where the normal scale is in two digits, set the scanner/new image resolutions to 10 times the scale (for example, if the scale is 1:33, set the correspoinding image resolution to 330 dpi). If this results in too high a resolution for your computer or printer to handle, multiply by 5 instead of 10.