My wonderful wife needed a study table. I made this out of poplar and a piece of melamine. The mortise and tenons are hand done, the top is doweled onto the legs and yes it does go through all of the tenons. You couldn't break this table if you tried. I'm not sure what the woodworker jargon is for this type of joint, but I learned it from building Amish poll barns. I know for sure it's quite strong and FUN! I guess you could say it's mortise, tenon and pin joint. Maybe you could comment if you know the "official" name.