To clear things up on the safety side is , The powder chamber is 6x6 in., 1018 bored 2 in.x2 1/2 in. deep hole, bottom cut with a 2 in. radius ball mill, and will be welded up inside of the 3AA2400 tank, A trunnion 2 in. X 16 in. welded the end of the chamber and to the end of the tank.
My other one is made of the same materials but the chamber is weld the the end of the tank onthe outside,
The base is made of Hickory , The trunnion is 1 in. behine the center line and gives no trouble.Just want to make this one right. Thanks for the help.