The modified ends need to go on very square. A little more care than normal was required here as it wasn't just a case of building a box with the adjacent side. The ends need to be a firm and straight pair of posts to hang, what are quite a flimsy side piece from. A square is pretty much the tool of choice here.
Both fitted. The marginally more pedantic may think it necessary to cut some 5-10 thou sheet squares to plug the holes inside - Possibly a step too far I thought.
As far as I know this is the only reference shot and is freely available on the web. It shows the van ex works (presumably 1888) with the 19th century lettering style.