We would love to give you exact measurements on this, but without knowing what material you will be wrapping/weaving, then we can give you the basics, but you'll have to do a little measuring on your end.
Step 1 - Cut in the sides by the depth of your rope. This will allow your rope to lay flat and not slide when woven. If you don't want to bother with this step, it isn't the end of the world, but your final product won't be 100% flat across the edges. If that doesn't bother you, think of it as saving yourself 15 minutes!
Step 2 - Using a yard stick as a straight edge create the dotted lines as shown above on your board. First draw a line running horizontally across the middle of the board. Next, mark a dot on the horizontal line, 2 ft in from each side. Then using your yard stick, make a straight line running from each corner to the dot on the corresponding side. (The left hand corners will run to the left dot, exc)
Step 3 - Drill a pilot hole in two places on the horizontal line to allow the saw or router to be inserted. You may make additional holes as needed.
Step 4 - Cut it out. Please wear eye protection and make sure your fingers are out of the way! The width of your cuts will be dependent upon the size of your rope. Thicker rope will require a fatter hole while thinner jute will require something small.
Step 5 - Cut your twine/rope/jute into 8 sections. Staple as indicated on the graphic above.
Step 6 - You will do one wrap for each piece of twine/jute/rope working in a clockwise manner. Starting in the upper left, wrap the first rope you come to once, and then move to the next one in line. Working in this manner will create the twine to "weave or braid" into itself as you work around. If you were to do all of one rope first, it would look fine, just different than the picture above. If your rope runs short, simply staple it off on the backside and continue on with your next wrap and a new piece.
Step 7 - Attach your Z clip to the back or bolt to the wall. It's as easy as that!