Suggestion: build it as a construct from the ground up instead of listing the alternate form as a power. It makes the sheet simpler.
Why do you have 17 listed as temporary constitution?.
Is it a PC or NPC? if it's a PC, you probably want attack/defense/toughness/damage able to hit his PL caps, if you want to go the tough route with 10 protection, you also want to take a -3 defense / +3 toughness tradeoff, you may also wish to take a tradeoff regarding save dc and attack, say, a +2/-2 to make him more of a bruiser.
You dont' need that 11 points of immunity, all those effects are fortitude and therefore included into the immunity to fortitude effects by default.
You list 30 temp str, should be 28 unless i'm missing a bonus somewhere. If you add a save dc/attack tradeoff, you'll probably want to raise that str to 32 (counting density bonus).
Regarding feats, you probably want attack focus (melee) and even attack specialization (unarmed) unless you plan to bash things with improvised weapons.
The regeneration you list under powers and the one you have under notes are different in rank (another reason why building the character as a construct from the ground up is a better idea than listing it all under alternate form).