I have no experience of working on just a border but I saw a method used for hand quilting and wonder if it might work for you.
Draw the design on tracing paper and pin this to the quilt. Now tack along the lines and then remove the paper this leaves the design 'thread drawn'. Remove the tacking stitches a few inches ahead of the hand quilting; this is made easy as the holes in the fabric from the tacking are still visable.
I wonder if you could work out the spacing of your cross hatching on paper and then use the tacking method not only for the design, but it would hold your sandwich together. I guess someone with more experience might see flaws in this idea though.