Well good news, we've agreed that the garage conversion is going to take place pretty quickly so I've been tweaking the designs more.
Decided to drop the skeeball as it's too big for the space, forcing my hand layout wise too much and not really in line with my primary focus of my hobby. Also the likelihood of me owning more than my one Alchemy pin isn't very high, so I adjusted for more regular dedicated cabs.
This layout allows for 15 uprights, 1 cockpit, 1 driver and 1 pin. I've been careful to address enough space so that every machine should be able to be played without anyone getting blocked in. I doubt I'll have any more than 10 people in the room on any kind of regular basis so I think the trade off between space and amount of machines is reasonable
The bar has comfortable seating for 6, room for two under counter fridges and space for up to 4 5-gallon kegs and taps along with a small sink and plenty of storage for glasses. Directly above the cockpits is an 80" projection screen. I may even put overhead storage around the bar to really create a centerpiece in the room.
Of course there's lots of room for change, but I think by basically leaving all the walls free then it leaves the most flexibility for me to see what works as my collection grows and changes over time.