Nice stuff.
Have just started to get my materials together for my own build.
Funny, I also have that mesh material on my Ebay watchlist as I have to wait for pay day before I part with any cash. January sure is a long month.
I used 3mm laminate floor underlay / foam to experiment with the shapes for the body armour. It might be a bit flimsy, but I have loads left over, so I can double it up.
What did you use to make the collar?
From my own experience of wearing this kind of body armour, I would attach the back piece to the 2 side pieces with an elasticated strap. It'll sit more snugly to your body, and if you stitch one side and velcro the other, it'll be more easily adjustable. I got such a thing today in a local charity shop. It was a ladies elasticated belt, about 4 1/2 inches wide and I paid the princely sum of £1.50.
H.