This seems like a very good example of a mod idea, so, welcome to IE Mod Ideas.
[edit: doublepost lol, merging my own posts ftw]
Ugh, fine, have it your way.
Note that this is quite untested (I can only hope that the regen functions as intended), but it works as far as I can tell - you can shapechange back and forth, and the stat changes show up as intended. It stops improving at lv25, though. Anything that gains +6 natural attacks = big NO as far as I'm concerned. It also gets the standard fighter HLA table.
As I said in the pm, I think that the kit should be able to get grandmastery in his claws (however they are classed) just because they are his only weapon basically...and he only has 2 attacks per round even with boots of speed....giving him grandmastery and consequently normal attacks would cement this kit in my opinion...
And not being able to dual class? That is pretty harsh...all fighter kits are usually able to....? No...
Would weapon specialisation (grand mastery), normal attacks and dual classing be so unbalancing?
A side question though....you are aware of the ease of use mod? My whole idea for this mod came about through that thing...it was quite overpowered and I played a fighter/thief with the use any item and used it (borrowed from Cernd); unstoppable; too overpowered and weird anyway.....like no real explanation for the elemental resistances and such...but one thing that bothered me was the lack of claw progression, which was stuck at +3 (and some enemies were unaffected....I thought it would be a good compromise to have a kit like this but the dual classing and normal attack progression...is reasonable, no?