As long as your DM allows it, the game's structured to allow anything.

And wow. 3NA, 2 Feats, and damn good stat adjustments for 1 LA. That's fucking cool. The only thing I've got to consider now if my Feral Gargun is still better than Bugbear (for the extra +1 LA) is powerful build. With powerful build, I can wield a large weapon insead of a medium weapon in 1 hand. (i.e. 1-handed bastard sword doing 2d8 damage instead of 1d10 damage).

Of course, the goliath has that too. +4str -2dex +2con powerful build for LA 1.
Vs FGargun, +4str +2dex +4con -2int good saves, 1 feat, 2 claws, powerful build, and 2 NA for LA 2.

I think the extra 4 dex, 2 con, and NA is worth the extra LA over goliath.
But is 2 con and powerful build > 1 level of fighter, 1d10+1d8 hp, 1NA, 1 feat?
Feats are nice in the beginning... Lets you get where you want to be. The extra hp will be nice too, but powerful build practically doubles my damage. Hrm...

What is it they say about silence being golden?