I talked to a vendor at a car show /swap meet last summer who supplies the window kits to do this. He also had power windows available. All designed and ready to install. If I remember correctly it was a couple hundred dollars for both doors.
I don't remember the vendors name and don't have his calling card handy. I'm sure I will see him again at same car show again in June if you're still interested then and want me to get info at that time.
Or I could dig thru my stack of papers and see if I could find his calling card. (might take awhile!)