Ed If you mean replacing the existing cabinet doors, with stile and rail doors, the jig can be used,,,, but the holes drilled to allow the screws to be put in place, will be very visible when the doors are opened. The holes could be filled with Bondo, then paint
over the area where the holes have been filled. Using dowels or biscuits to form the corners is another way to join butt joint assemblies together. Kreg jigs are a very special method of making cabinets and cabinet face frames where the holes are not visible, or they do not interfere with assembly. I own this Jig and have used it often as a cabinet maker. One can make new doors with a bit more expense with coping and sticking router bits, that would make a detailed edge, then use light weight
1/4" inset center panel.