Here you can see the space between the cross bars and the plywood board.
This is also when we found out that we have the "good side" of the plywood board facing down and build everything on the "bad side" of it. (This was mistake number one).
But since we're going to build a lot of landscape, we don't let this bother us to much.

The World wasn't build on a nice even lanscape after all. :-)