Im looking to replace some interior doors..the wallls are all framed using 2by 3's.. standard prehungs are made with 4 9\16 jambs.. In the past i have actually used a 2 piece casing method on the interior side of the door which doesnt look to bad however it doesnt look right. i have thought of ripping a side down but the jambs are enginered and are covered with veneer. I would think my only solution would be ordering the proper doors which wouldnt be cheap or making the jambs myself which i have also done in the past but its too much time consuming and i need 10 doors .. my last thought would be ordering the doors standard with an actual oak jamb that I can rip too fit. this is a paint package house that is being converted to all oak so i cant use the existing jambs.any other suggestings would be great

 

You may have mentioned this, but you can rip down 1/2" stock and use it as jamb extensions for your trim molding, fitting it snugly or even allowing a small reveal outside the casing, nailing it in place when you nail down the case molding. That way, you can use the clamshell door units.