ORPG Masters enter here

[RiskDude]

hey dudes i need some help with my new project as you can see in this video YouTube - [RotH] Rise of the Heroes (ORPG) , how can i make buildings like that and how can i make a non entering area like walls cuz if i make EX a farm with scale 5.0 or whatever i it has only the model big and i can walk into wall and get into the house. Oh and the circle for the building is this in the midlle of the model so if i click it, it sends me to that circle, you know the green circle that appears when you select a unit