Feel free to download and use
I used about a square metre worth of thick, black, closed cell foam rubber from Clark's Rubber in Australia to make the vest itself, and a thin strip of foam rubber to make the side straps. The pouches are just boxes wrapped in duct tape. This was a rushed job so no time to make nice pouches!
I re-used the pouch from the sniper cosplay here: [link]
Contact adhesive (CHECK the description to see if it works on rubber! Some types will corrode rubber)
Box-cutter (the sharper the better. Even so, foam rubber will pucket easily...I just lived with it)
Six drink cans (Get big cans if you are a big person and small cans if you are small. Not rocket science!)
Foam rubber is bendable and rather elastic. And these measurements assume that you are wider at the shoulders than at the waist. So a lot of 'GUESSTIMATION' was at work here....treat the tutorial as a guide, not a bible, and accept that most measurements would only be correct to within +/- 2cm!!!
This was a rushed job completed in a day, so if I make improvements to the design, I will post a new blueprint.