Looks good Rudl! Just be careful - only having 4 lines on the outside of a surface does not just by itself make a surface to be planar. If you're using a construction tool like sweep or network to build a surface between any 4 lines it's pretty easy for that surface to be warped in some way instead of being flat.

If you created all those surfaces by using Construct > Planar or Draw solid > Plane then it should be ok though.

- Michael