For now, I'm rescaling the Kobold heads in CEP that go on the halfling bodies. I plan on making more draconic heads that will be a great deal more complex.
I numbered them so that they shouldn't overlap with any other head models, unless you have a HUGE number.
NOTE: These will not appear in the toolset, but they do work.
To use these as override heads, simply copy the .plt and .mdl files to your override section in the nwn directory. They can be compiled into a hakpak as well, but remember to include the corresponding .plt skins.