Some thoughts.
Dermal hardening and nerves of steel are strong, however spamming them on every champion is boring. Shooty guys don't need nerves of Steel (its useful on a heavy bolter for the first game or two until you can afford suspensors, then its a wasted skill).
Something more original (and fun!) would be taking Unborn on your Leader, and giving him either Savant or Shooting access. Munitioneer for example would make that heavy bolter more reliable.
Generally speaking, you don't want backup melee weapons at gang creation, especially not with an expensive gang like Goliath. Your leader is a good example of this, with that Heavy Bolter hes going to be in the backline firing every turn, why spend creds on a power hammer he'll rarely, if ever, use? Better spend that cash initially on a gun somebody will fire every turn, then why you've filled out on bodies and given everyone a good primary weapon, THEN spend money on backups.
Your champion doesn't need dum-dums on his combi-pistol, he should be shooting that plasma pistol, and then if that goes out of ammo he should be hitting people with his chain axe, don't spend points on the weapon you never want to use.
Melee gangers should be bullies, not bruisers because they're cheaper and their poorer BS doesn't matter so much, so you can save some points there as well.
