Interior wood doors, as industry standards have it are 1 3/8″ thick. The stop moulding on any given interior door jamb is a plant-on trim mould that can be taken off and renailed elsewhere. During any rehabbing we have our eyes peeled and become conscious of our surroundings all the while gleaning new ideas. If that perfect, unique door turns up at a local garage sale but is a 1 3/4″ exterior door, don’t fret, it’s adaptable. 
As you visualize this nugget in it’s new home it becomes even more perfect, after the stop mould is off the door is needing a little fitting per size, press against jamb and center in door opening, scribe the other side and plane down 5/16″ less then hole. Bevel edge cut 3 degrees with high side of bevel on the hinge side of door (side it opens into) on both edges. Use as much of the old and new hinge mortises with at least 3 hinges, 4 even better. The door should hang flush with the closed side of jamb so use your measuring and basic math skills to get it as close as you can.