I welded both sides and it’s relatively straightforward. I just tacked all the bits in place, removed the bolts and spacers and finish welded the fittings. All in all it turned out just like I wanted. The second hole inboard is for the aft brace wire. There is a LOT going on in that cluster under the cargo door! The last thing to do is weld on some tabs for the water rudder pulleys onto the longerons closer to the tail