I have used the markings on my staff to set out where the CT go and then set them out on a grid pattern having counted them along each side of the orginal. The distances between the CT on the vertical, horizontal and diagonal axis are the same for all the interwoven strand patterns with the exception of those based on the vertical strand double guilloche (a variation of the double guilloche where the CT are set closer together.
Once I have the CT drawn in for the top bottom and right side sections I start to draw in the strands. At this point there is one very important concept you need to grasp;
'The CT do not exist, the strands must be drawn in as strands, not just lines connecting the CT'.
It is about viewing these patterns in a certain way to help you visualise them as three-dimensional objects.
These strands are drawn in, in a way that is the same for any pattern like this, the sequence of strands going under and over each other makes it easy to know where the next ones go. You need to draw in the pattern as much as you can looking for the point where it may go out of sequence. This will be apparent in the other photos.