It's not hard to make. It'll just be very time consuming and take lots of cord. For a regular cobra weave you can guesstimate about 1 of cord for ever inch.
If you need any help with anything just let me know.
Cool. I want to just make a simple OD sling that ties to the front sight post and the top of the collapsible stock. I built a "Retro VN Shorty" and think the paracord would look cool on it.