I've come up with a new technique for modeling real life objects in 3D, a refinement of my previous technique. It won't work for all objects and may not be perfect yet, but I've put together an illustrated guide that will help you use this technique in the future.
From here it's similar to the previous process. Import your image, turn on grid, make sure the units are set up the same (in this case I was using quarter inch graph paper) and trace the image. Be sure to mirror it to create the parts that you're missing.
When imported into Inkscape the stamped images don't lend themselves as well to Inkscape's trace bitmap function so I had to do most of this by hand. Not really that big a deal.
(At the time of this writing I was having trouble with inkscapes svg not exporting to the proper scale. Theoretically if you've set things up the exported SVG should import into blender all ready properly scaled, which is half the point of this process (the other half being getting the shape right). Unfortunately I didn't have that happen for me. So I had to fudge it on the scale using my digital caliper. Here's hoping you have better luck.)
blender and from here's it's just blender-fu to a 3D object.