Look what I found on the internet. This cityfight board is made up of 2 foot by 2 foot tiles. Now I've made a few modular cityfight boards, and seen quite a few more, but none have impressed me with the simplicity and usability of this one here.
yes that's the same board rearranged
And this one:
Check out some more ways they can be put together here and give Neal some feedback!
http://nothingunpainted.blogspot.com/2012/11/cityfight-table-wip.html