Perfectly circlular walls/roads in CD3? Establishing scale in CD3?

[NeonKnight]

Try using the circle tool to make two concentric circles, then the Multpoly tool to make it a single entity, and finally change the fill of the now filled object to the same as the rest of the walls. Same for roads.

As to establishing scale, how do you mean?

[Krases]

Thats one of my problems though is getting two circles to perfectly center on each other. I can't get them to line up. Ive figured out the multi-poly tool though.

I guess what I mean when it comes to establishing scale is how can I build some tools that help me tell how large things are? I would love to have some sort of ruler I can use to give some approximate distances.