I started to build this massive pvp arena earlyer today its current size is:
115x155x29 (29 is the height)
it will have alot of build in traps (these will require controller block if you want working traps)
i might post the schematic when the arena is completely done
Edit: added new screen of current state
Edit 2: added info in update log
Edit 3: project done including a video (video made by overmoney)