Vivisection

Requirements

Kurd will need body/parts of the appropriate race for chirurgery:

To change skin color or gender, you need body/parts of the same race and of the same color or gender you wish to change to.
To have limbs replaced, you need parts of the same race. [How about related races such as dana and quess?]
To change your race, you will need a body of the new race you wish to become (of the sex you want!)

When changing race, your new race has to be within 10(?) assimilativity of your current race.
Some races may be "psychically incompatible."
To vivisect into a Greater or Great race, your incarnos must be a Hero or Legend, respectively. That is, with a Hero or Legend you can create new incarnoi of Great/er races, but existing incarnoi must be Heroic/Legendary to vivisect into a Great/er race.

Some races, due to their physical [or mental?] composition, have further vivisection restrictions. These include:

Nylocs - Cannot use any vivisection services. "I can only work on flesh and blood creatures."
Aethoss - Cannot change race, due to not having brains. Supposedly able to use limb replacement without danger of negative stat adjustments, but this is frustrated (last confirmed around Aug. 10, 2010) by the need for a limb, where Aethoss leave only sticks when they lose limbs.

Changing gender will Adjust your stats up to +/-4(?). The sum will not necessary balance out!
Changing race shuffles your stats completely randomly(?).

Kurd can fuck-up chirurgeries with catastrophic results.

[This is supposed to be a list of factors; I've put my uneducated speculations in italics. This needs to be updated.]

[List of what can happen when Kurd screws up.]

Scarring - Kurd's services tend to cause scarring, even when successful.
Accidental neutering.
Permanent negative attribute modifiers (Morgana got -2 Dex and -1 Str from having a foot replaced) its rare, but it does happen. (Only happens with limb replacement, not limb reattachment.)
Unwanted body-part colors.