I recently purchased a Williams scale GG1. I hesitated buying one for quite a while as my curves are 054 and was concerned about overhang trashing my accessories I had an opportunity to try one on my layout and found it would work with some relocations of Miller signs. After it arrived, I installed an ERR Railsounds kit as well as 5 mil LEDs behind the headlight lenses and chip LEDs behind the side and front markers. Finished it yesterday. See video below
Roger