1. Add a ruler to both the X and Y axis. The ruler should have both MM and Inches...? Or at least the ability to change them.
2. Make the entire SVG + ruler SCALE-ABLE. Allow the user to scale the size (using either a slider or drag), so they can match the ruler up to their computer screen and have all of the sizes correctly.
3. Allow an HREF/LINK to be assigned to each of the SVG boxes.
You can see the thing working here: http://maydaygames.com/sleevefindertest/index.html
Remember, add a ruler. Make it scale-able, and allow a LINK to be added to each selection.