12/4 Rift Oak to make stiles? All due respect, but I don't know if I have ever seen 4 boards 12/4 Rift that would make a stile in my life. I could buy a truckload and never see a board to make a stile, and it would all be top grade. You would have to go to the mill, specify, and be prepared to pay real premiums and then more for proper kiln drying. W Oak is hard to dry.
JeffD would be better off using pattern Honduras for his paint grade doors.
The difficulty of sourcing good stile stock is why stiles are so often made with a b grade core and faces from 1/32 to 1/4" of good wood. That is a solution for many shops, and a good one.
I don't like the time it takes, so I build paint grade in Poplar if it is on the low end, or soft Maple if I can tolerate another 15% in selling price. It is a bit harder and a bit heavier, but is more stable than Poplar for the most part.
I buy about twice what I will need, try to specify or request optimal lengths, pull stiles first, and have plenty of stuff for set-up, drawers, blind panels or smaller stuff. I can glue for width if needed quickly and easily, so that is a card that is often played. I think larger loads give a better percentage of potential stiles than smaller loads. Unit/bundle quantities make it easy for your vendor.
I cannot pick my lumber since all my stuff comes from a distance away, and it would cost twice as much if I added my labor to pick. I do talk to the vendors about what they have, tell them price is not much of a factor, and just request a honest appraisal of what they have on hand.