Given my limited carpentry skills, I am proud to say that I was able to cut the board to the same size and was able to drill holes well enough, using the shelf liner as a guide, to even get all of my screws to line up close and put back in.
A well placed bottle cap screwed into place gives the extra distance needed to press the plunger and make the light go off at the bottom of the door.
Before I put on the bottle cap I was able to see just a bit of light around the seal.
Should I just not worry about this or is it worth the effort to add some thickness under the door seal or possibly on the freezer itself where the seal meets?
Thanks for the help.