Do some checking, chances are good that you will find at least 1 sawmill closer than that. I found out years ago that there at lease 7 within 20 miles of me, and I didn't even include the guys with the small bandsaw mills.
But looking at those doors, looks like a pretty simple build, especially if they are 100 years old. If it were me I'd just do a bit of measuring, get whatever wood I wanted, along with enough for a bit of practice maybe, and make some doors.
