Nice set. You don't see the grenade pouches too often. To be properly set up, your gas mask carrier needs to be on the left side as worn otherwise you can't access your mask.
It can be worn either on the belt or on a sling so that when you remove your webbing you still had access to your mask. Situation dependent but Mike is correct in that we normally (not always) used the sling.
Some good prices. Some WE64 pieces seem to be drying up in the market, I haven't found much of it lately. I have plenty of belts and pouches...can't seem to find any yokes.