Downloaded the Ed Bertschy Fordson tractor here on Zealot and for the life of me, I can't determine what scale it is. I'd like to print it out in 1/24th scale, but the sheets don't seem to have even a benchmark from which to work off of.
You might want to try a PM to Mike Hungerford as it was originally posted on his old Smartgroups site. He's the owner of the Google Papermodels II(?) site and is a member here and at PM with the user name Chthulu. hth.