If I could give u a little advice, I do not think that fixed positions of farmsteads or slots for farms and similar things will be good idea. After few games online u can predict position of this positions etc. As someone said, Aoe was something like unlimited, maps were randomly created ,u could build as many buildings as u want etc. I agree with pop limit thou. It is more friendly to player if he can build as much farms as he want and everywhere he want, this freedom leads to joy. xD