thanks for the feedback
when said about it being diffucult to enforce a height limit, we could load and unload the map when a spare op is available. and if it dosnt work for floors, being that some people might make a 'floor' 10 blocks high it could be bought 1 row at a time.
with the spleef arena couldnt it be opened only when 2 ops atleast were online, one for guest the other a ref. or a schedualed spleef opening times, this way people wouldnt constantly be asking.
and when said - 'a set genre of building type to fit in a city' - would that mean they would all be the same material?