As a "class", it is too powerful. What I mean is that when compared to other base classes it is waay over the top.
No base class has d12 Hit die, 2 good saves, 6 sp per level (and 12 class skills, one of which is Knowledge (all)).
Is this supposed to be a casting or a combat oriented class?
As pointed out you can't be all paths at once.
Adjust to a single good save, 3 class skills (and 3 more based on type). Hit Die should be dropped to d10 (although a d8 is more likely for "balance").
Drop the multiply low light vision by 4 if already have it.
There is a reason that the template (and other ways of doing this) have a LA.
Need to list that type changes to "dragon", this is important due to how spells interact with "types"
(disclaimer: I'm solely talking about class balance and optimization potential here)
I don't see the OP's attempt as too powerful. In fact, I believe it's a class with a decent chassis, but far too little focus where class abilities are concerned, rendering it less than good for any purpose you might have in mind. Most class abilities seem to just duplicate dime-a-dozen magic items (flight, energy resistance, natural armor, ability bonuses [and why do those start with int and cha, only giving you great str at the late levels?]). There's a serious lack of non-generic, versatility-enhancing class features.
The only thing pseudo-unique (not counting the many, many dragon-themed classes out there...) is the breath weapon. Which, as a low-to-mid-damage blast, won't do much, neither really complementing a different (non-blaster) character role, nor amounting to define the character's role on its own with the long recharge times. Still, it's a nice fallback, kinda like a Warlock's Eldritch Blast. Sure, you get no blast shapes or essences, but that's what metabreath feats are for.
The not-so-nice part of the chassis, the Medium BAB, works similarly as in the Monk class: it firmly establishes the style-over-substance problem the class already has, in that it takes away even its ability to melee with the warrior types. Lack of weapon and armor proficiency sharply exacerbate this problem.
What are you going to do with this guy in a combat situation? You're either going to use a breath weapon feat with your breath once, then be out of interesting options until it recharges. Or you're trying to rip it up with your natural weapons, but medium BAB and lack of a source of good damage of some sort hampers this approach quite a bit. Or you're going to put that Use Magic Device skill to use. But the latter could be done as well by an Expert of your level.
Way I see it, this can be a very nice dip class for the first and maybe the second level. Taking more is probably not worth it. Taking all 20 levels is atrocious from an optimization viewpoint.
That said, in an E6 (maybe even E8) game, the OP's class would fit nicely and would still be able to compete.
