I am building a dining table and wanting to use mortise and tenon for the legs and aprons. What size tenons should they be? I'm thinking about 1/4 inch thick, but think that might not be enough. The aprons will be about 7/8 inch thick, maybe 13/16, don't know for sure what demons ion would be the best. Also, about how long should they be, 1/2, 3/4, or full inch long or longer? Thanks for any ideas or dimensions you have used!