VagaboundSusan said:Hopelessly waiting for a good weather report and a huge shot of courage.
Looking great!
You could take the van to a local body shop and have them cut a 14" square opening for you. Bring the fan with you so they will have the exact size to work with.
If they are not busy they should be able to do it while you wait.
Then drive it home and install the fan yourself.