Blending Options-Stroke

Take now the following tool

and insert a horizontal stripe inside the already drawn frame. Its color is
585D60.
Blending Options-Stroke

Now we should merge down in a group all the layers composing the frame. Copy the recently made group two times and place everything the way it is demonstrated in the next picture.

Create one more frame inside the represented site’s sections.
It’s possible to do this operation by using this instrument

which will be helpful in representing the outside bounds and then keep holding the
Alt button to erase the inside part with the same instrument.
The shapes may be corrected with the following tool

.
