I intend the body ability to be the entire first level of the class, second level would grant the other bonuses of each race's first level and third would count as the first level of each class for progression purposes. Thus Tauric Angel/Pegasus would look something like this:
1 Angel Slam attack, Pegasi move speed, Pegasi Hoof attacks, Choice of either angel or pegasi AC bonus.
2 Pegasi Spell-like Abilities, Divine Blood, Scent, Celestial blood, Heaven Miracle, Change Shape
3 Counts as the 1st level of each class, Something Else...
So at level 3 the Tauric Angel/Pegasus has the powers of a level 1 pegasus and level 1 angel (with bonus spell slots due to Divine Blood) and could go strait into the second level of one of the classes without having to take the first level again.
Thoughts? Don't want to start a thread for a half baked idea. It is not based off the CR of the tauric template either, being as it has +0 CR (And is ridiculously broken)