Having read through the world info, character profiles, and team 1's IC thread, I think I'm going to go for a different character concept. The Doppelganger was an interesting idea but doesn't fit the world as well as I had thought it might. Also, if our campaign is anything like the team 1 campaign I don't see him being able to contribute meaningfully to the party.
However, reading the world info pointed me in some new directions. I like your take on Dragons in this world (very elegant way to incorporate the monster classes) so new idea:
Nuclear Dragon: Born to Red Dragon parents (but that's no guarantee of what hatches anymore.) Unable to use magic, like most Dragons nowadays, but finds he has a knack for something different and destructive. With no leads among the Dragons as to what this thing he can do is, and desiring to test himself and grow stronger, he journeys to human lands in search of knowledge and adventure, not necessarily in that order.
EDIT: Related rules question: Can I combine an attack with a manufactured ranged weapon with natural attacks the way I could with a melee weapon (assuming I'm in range with my natrual attacks, of course)?
Yall think I should drop the druid acfs so I can use armor and shields along with spontaneous sna?
How integral are the ACFs to your background and concept? Also, do you think you'll have more fun playing a raging, tracking, monking Druid or a more conventional Druid?
Mechanically, the standard features are probably more powerful (definitely once we reach 5th lv, Wild Shape is a big deal) but it's not like you'll be woefully underpowered as you are.
Also, if you drop Avenger you get your Animal Companion back, which is kinda like an extra half character. Is that something you want for your character?