Monte's Ghoul Template ??

[Henrix]

Why not just follow the template in question?

 

[(Psi)SeveredHead]

You should use class-based progression. However, for racial Hit Dice, eg ogre HD, you should use the undead progression.

PirateCat's ghoul Deepwood Sniper seemed dangerous, even with poor BAB. Then again, archers never miss

 

[Xarlen]

The half dragon raises HD, and allows for class progression.

I see nothing wrong with advancing it by class.