I have used some "aran" style crochet to make this. When I started to crochet I never knew that you could do this sort of thing with hook - I thought aran was the preserve of knitters.
For my cover I use a sort of roaming cable, that drifts back and to across the front ....
I've started writing out the pattern, but without photographs of what I mean by a "front post double crochet worked in front of the previously missed stitch" its going to be almost unintelligible !
I think that this is providing me with the perfect opportunity to create a proper stitch guide that I can add to all my patterns & also include here.
Hopefully next update will be to say the pattern is finished & I have a full (or at least the start of) my stitch guide.