For those of you who aren't a member of the Facebook group, this could be of benefit. The one thing I think the Arcade1ups have in it's favor is size (it's also one of the biggest detractors). In the first pic is an adult playing Pacman and while the cabinet is definitely shorter than a normal cabinet, this doesn't look unreasonably uncomfortable. I don't think it's too bad.
I also think some rooms are just better candidates for smaller cabinets. This could be cabarets, or poker machine conversions, but the A1ups fill out the space sufficiently. 2nd pic.
For your Veterans of BYOAC, the last pic is kind of funny. It seems some of them are going through the same growing pains. It just goes to show, it doesn't really matter what size the arcade is, someone wants to put way too big of a CP on it.