This drawing looses it's "top" when imported

Technical Problems SketchUp
1

This .dwg file won’t import correctly. What’s up?
base1.dwg (21.1 KB)

Any ideas would be appreciated.

Thanks

2

How should it look like?
My import looks like this:

3

If you mean that there is no face on the other side, like below, I don’t know why that happened, but it is trivial to fix. Just open the group for edit and redraw any of the back edges.

4

If the model should lie flat on the ground, it is incorrectly modeled in AutoCad. It is placed on the red/blue plane (XZ in AutoCad). In both AutoCad and SketchUp the “ground” plane is supposed to be the XY/Red-Green plane. Was this modeled in one of the old-style 3D applications the view the world as a “stage”?

Anssi