There are a couple of different ways to affix the webbing to the armour. The sturdier - but more expensive - option is to use snap plates. Alternatively, industrial-strength velcro can be used. I'm not planning on any intensive trooping to begin with, so for now I've opted for the latter option. If it doesn't hold up, there's always the option to convert to snap plates at a later date.
Unfortunately industrial strength velcro is a little tricky to come by back home - but as lack would have it, it's relatively easy to procure in the US. I ordered a couple of packs earlier this week, and they turned up in the mail today.
With this, I've now got pretty much everything I need to get the suit completed as soon as I'm back home!