I have a question about the effects of the axle on the structural integrity of the frame I am using 2 x 3“ 11 gauge frame and I have penetrated through the frame with a 2 inch axle. Is it critical that I weld both sides of the outer frame (see pictures) or is the framework around it enough? The shack will be 6 x 10 and is going to be relatively heavy. Thanks, Dave....