Originally Posted by Pyromancer999
I assumed that that was already the case
As you have the class written, you get the exact damage die of the monster class - so the Imp gives a Tiny-sized stinger, for instance.
The thing with the HD = class level is that (a) it's currently written to apply only to save DC, whereas it should also probably be used for spell-like ability CL calculations and so on, and (b) as written, you use half class level for the HD, which is then halved again as part of DC calculations, so DCs are ridiculously low. That's probably a typo, but bears mentioning.