Alot, as with higher or smaller resolution the range finders would be off. On a higher resolution, the range finders would be too smal to actually cover the correct range, and at a smaller resolution at what they are made at, they would be too big. Throwing off your rangefinger "guesstamation". As an experiment, try using a 640 ret range finder at 1024 resolution... heh
Anyways, if no one has it, you will just have to make it yourself...