Go have a search for "Viewing grid lines in 3d view" over at Autodesk knowledge network and you'll get, and I quote the s olut...

The subject of a No Plot text in Revit is a problem I've heard about for many years, and finally I can give you closure in this delicate...

When posting yesterdays picture I thought that an elegant solution for my spaghetti monster of a definition was far off, but thanks to Colin...