The diagrams you found are what a lot of troopers followed. However, when it comes to the interior of how you want your armor to be held together, it is all preference. I recommend having more snaps. You can never have "too many" snaps. I believe your 2'' nylon and 2 snaps method is pretty standard. So a great choice.
Rare Earth Magnets. Again, up to you, but as long as they hold things down in place! Here is a great tutorial on which ones are recommended, and how to use them! Hope it helps.