Hello Sketchup guys,
I have a cardinal problem → to make face from a shape (originally exported from autocad). Tried tu use and combine various plugins to make it flatten and have all Z coordinates at the same level - find some gap in between particular lines and tired to make face (Unwrap and Flatten, Edge Tools_2, Make Face plugins…). Nothing worked to solve my issue. When I tried draw a rectangle on the shape, it didn’t intersect at all. Please see the picture below.
Thank you in advance for help! 
Filip