Welcome.....now get out as soon as possible!
Seriously, the fact you're wanting to work on them is big. You may find yourself liking to work on them more then playing at times. As for upkeep .... the old saying "it's a steel ball with plastic parts comes to mind". It's not a matter of will there be issues it's a matter of there will be issues.
btw - having space for 4 machines is nice BUT start looking at where you can put the 5th one and so on. Might also want to look where you can expand your gameroom! You'll laugh reading this but trust us ..... the time will come!