Yep... I knew that was something bothering me with the buildings... the hachure in the buildings interiors is there just because I didn't know what to put there(roofs, interiors, black color...)

tilt, I think I'll go with both, interiors at the center and roofs at the edges of the map.

mearrin69, when you say rounded, you mean those with rounded bases, right? Not just the rounded roofs.

Guys, I appreciate the comments, keep them coming!