Okay, so looking at Dracolich, I am reminded that Dragon PCs make no sense.
So I present: The Dragon Class:
Dragon
"I am a motherfucking Dragon."
Your Race is Dragon, Your class is Dragon. You are a motherfucking Dragon.
All your levels are in Dragon. You are a Dragon.
1) You have a HD equal to your ECL -3. These are badass dragon HD, all good saves, good BAB, 8+Int skills.
2) You have a breath weapon that does 1d6 damage per HD, and you use it every 1d4 rounds. DC is like all DCs. 10 + Stat +1/2 level.
3) You have spells per day/known like a Sorcerer equal to your HD -3 (or ECL -6). Your CL is equal to HD. (include crazy domains for Fang Dragon)
4) You can motherfucking fly. It's like a Dragon of your size.
5) You get more attacks like your Dragon does, based on HD.
6) You get the size of the dragon size you are based on HD. You get the stat changes for size change, which are none, because in this case you are medium.
7) You get no ability mods other than that except +2 Con, +2 Cha. PB yourself like except only use 34 PB because you are so Charisma SAD.
8) You get SLAs and weird abilities based on ECL. CL equals ECL. On the Fang Dragon chart, you are at Dispel Magic
9) You get Natural Armor like a Dragon of your HD.
10) You get Spell Resistance equal to your ECL+10.
11) Keep in Mind, you are a Dragon, so you can take all those crazy Dragon feats.
Fang dragon modification:
You have all that Fang Dragon shit as your Dragon special abilities. You have no breath weapon, like a Fang Dragon, you do the Con damage like a Fang Dragon.
Dracolich modification:
You lose Con to HP. You have crappy HP. It's okay, you have a Phylactery.
You get all that other Dracolich shit, including +2 to Cha. You don't get a change to Spell Resistance.