I did use 0.005” brass for the lower vertical end panel, mainly so I could solder the brackets for the air reservoir on the B end. In addition to using CA to attach the air tank to the brackets, I’m also using pieces of brass wire as pins for a mechanical connection. Once the end cage assembly is attached the brake components will be inaccessible, so I’m taking great pains to secure them in place.
With each new piece and detail, this lump of plastic is beginning to resemble a covered hopper car again. I can already see that the reward will be worth the effort.