Here is how I make the frames for my upholstered chairs. It's mortised and tenoned at the critical joints, the seat and arm rails to the legs and the crest rail to the back legs, these joints take the most abuse so I think they need added strength, but I also use pocket screws to lock in the wings and pull thru areas ( the areas not taking such a beating over time). I have tested the strength of this method and have been very convinced it will hold up for more years than I will be around. I paint the legs with Milk Paint before the chair gets any fabric. If anyone is looking to make an upholstered chair there's alot of things an upholster needs for him to cover the piece. Once I finally figured out how to make everything for this chair (which by the way, was off of a photo with the chair covered in fabric, not easy to do), I made my patterns and came up with what I thought was a pretty good proportioned looking chair. Of course when it's covered, the cotton batting and all the fluff makes it seem a bit smaller but you still have plenty of room and I do have to say these chairs are extremely comfy.