Hey Jimmy, I've played this list and it's a lot of fun - great theme!
Some thoughts if you don't mind: 
 - Would it be possible to have upgrades that add more infantry to the Penal Company and Abhuman Mobs like in the standard I.G. list? For Example:
  6 x Penal Legion Troopers and 2 x Penal Legion Taskmasters for + 100 points
  4 x Abhuman Penitents and 1 x Penal Legion taskmaster for + 75 points
This way a player could make large human wave type formations which really fit the character of the army list that you've created.
 - Could Abhumans get a 6+ FF like Chaos Mutants. It's not much, but it's still better than no FF value.
 - Maybe giving the Land Transporter a heavy weapon of some kind, again it's not much but it would help as the infantry have no ranged weaponry.
 - Instead of the Mass Containment Transporter, the list could just use the Gorgon. They are a common Chassis in the fluff and it would help the low quality infantry to have some decent transport, so they can get to their destination...and then die.
 - Could Stormhammers be an option for SHTs? 
