Mine's a Richardson, but when you order you specify what floatant you use and they size it accordingly.
I use Gink most often, but I was thinking about adding a second holder for Frog's Fanny. I use the Gink on all hackled flies but I do use Frog's Fanny on CDC flies. Currently if I plan on using CDC I throw the Frog's fanny in a pocket somewhere, but it'd be nice to have it accessible like the Gink.
Yeah, the hardest part is a place for loose stuff like keys, shot, tippet, and snuff. I usually put the keys in an interior pocket under the waders, since it doesn't have to be accessible while fishing. But the rest has to be accessible.
You gotta be a little careful when buying waders so that you still have access to the chest pouch. My G3's work ok with my Richardson, the pocket is deep enough that the items sit below where the box sits on my chest. But it's still a bit of a hassle to access them. I don't gotta take the box off, but I do have to fumble underneath a bit. My solution has been to wear shirts with zippered or Velcro breast pockets. Then it's to the left or right of the box. But carry only 1 or 2 tippet spools to keep em from getting too thick. If you can't handle that, get a tippet tender and hang it from the straps.
Other items, like a camera and a flashlight. Use the wristcord, wrap around suspender belt on the waders, tuck under waders so they don't flop around.
Seems like a lot of hassle, but honestly, ditching a vest was the best thing I ever did. Forced me to simplify a bit, and did wonders for my back. And I go to my fly box far more than any of these other things. With any other method, you had to fish around for fly boxes. And you may have a bunch of them to sort through. Now, I hold more flies, and they're immediately accessible.