Nice. I only have 4 EMs but I keep them in chronological order. I have other pins too and it's neat to show people the technological progression from the 70s to today.

I do the same.

That Sky Jump looks familiar!

Arranging by chronology makes sense both historically and aesthetically. Doing so works well with pinball machines because dimensions tend to have evolved uniformly. In contrast, my EM arcade games are so diverse in length and height that I have them lined up to enhance the visual field of players and spectators. For example, two games with tall domes require separation by a low profile cabinet game.

I also aim to have every game in date order starting at 1950 and ending at 2015!

I went with the staggered look. My reasoning was that it filled up the back wall evenly (I don't use toppers, art, posters etc). So a woody would be next to a wedgehead, which is next to a multiplayer...repeat.