Mreza, I think the door looks like it is holding up well. If it bows a little, the joints have to open up on the bowed side or something will give. Yours is so slight, only you will notice. I always double up tenons so none are wider than 2.5" but I would have thought the stave core would work with wider and not have the tendency to bow. 16 years ago I broke every rule of woodworking and made a door with 3/4" rift oak on one side and walnut on the other ( long story, little choice given the time). Every summer it bows towards the oak side but the joints hold. were it exposed to the outside I would have expected to hear an explosion when it burst. The finish will be what catches the eye and that will always be the hard part to deal with. you should consider that door a success. Dave