I know it's been a while. I got the box all together and on. Got all the bolt holes for fenders, which was not easy with the truck being so low and no hoist.
This is the front of box side support I made had one of the fender bolts go through it.
Had to cut some of the front of box to clear frame and wires. There will be a bracket to hold front to frame.
Also got the box top tubes welded on turned out very nice.