Also:

Some stats i came up with:
BanehammerType Speed Armour CloseCombat FirefightWar Engine 15cm 4+ 6+ 4+
Weapon Range Firepower NotesTremor Cannon 60cm 1BP Disrupt, Fixed Forward Arc
Twin Heavy Bolter 30cm AP4+ -
2 x Lascannon 45cm AT5+ -
2 x Twin Heavy Bolter 30cm AP4+ -
Damage Capacity 3. Critical Hit Effect: The Banhammer's magazine explodes. The Banehammer is destroyed, and any units within 5cm of the model suffer a hit on a D6 roll of 6.
Notes: Reinforced Armour. Transport (may carry two Ogryn or any five of the following units: Imperial Guard units: Supreme Commander, Commander, Infantry, Fire Support, Snipers).StormlordType Speed Armour CloseCombat FirefightWar Engine 15cm 4+ 6+ 4+
Weapon Range Firepower NotesVulcan Mega-Bolter 45cm 4 x AP3+/AT5+ Fixed Forward Arc
Twin Heavy Bolter 30cm AP4+ -
2 x Lascannon 45cm AT5+ -
2 x Heavy Flamer 15cm AP3+ Ignore Cover
Damage Capacity 3. Critical Hit Effect: The Stormlord's magazine explodes. The Stormlord is destroyed, and any units within 5cm of the model suffer a hit on a D6 roll of 6.
Notes: Reinforced Armour. Transport (may carry four Ogryn or any eight of the following units: Imperial Guard units: Supreme Commander, Commander, Infantry, Fire Support, Snipers).BaneswordType Speed Armour CloseCombat FirefightWar Engine 15cm 4+ 6+ 4+
Weapon Range Firepower NotesBanesword Quake Cannon 75cm 2BP Macro-weapon, Fixed Forward Arc
Twin Heavy Bolter 30cm AP4+ -
2 x Lascannon 45cm AT5+ -
2 x Heavy Flamer 15cm AP3+ Ignore Cover
Damage Capacity 3. Critical Hit Effect: The Banesword's magazine explodes. The Banesword is destroyed, and any units within 5cm of the model suffer a hit on a D6 roll of 6.
Notes: Reinforced Armour.DoomhammerType Speed Armour CloseCombat FirefightWar Engine 15cm 4+ 6+ 4+
Weapon Range Firepower NotesMagma Cannon 60cm MW4+ - Fixed Forward Arc
Twin Heavy Bolter 30cm AP4+ -
2 x Lascannon 45cm AT5+ -
2 x Twin Heavy Bolter 30cm AP4+ -
Damage Capacity 3. Critical Hit Effect: The Doomhammer's energy coil explodes. The Doomhammer is destroyed, and any units within 5cm of the model suffer a hit on a D6 roll of 6.
Notes: Reinforced Armour. Transport (may carry two Ogryn or any five of the following units: Imperial Guard units: Supreme Commander, Commander, Infantry, Fire Support, Snipers).HellhammerType Speed Armour CloseCombat FirefightWar Engine 15cm 4+ 6+ 4+
Weapon Range Firepower NotesHellhammer Cannon 30cm MW3+ Ignore Cover
Twin Heavy Bolter 30cm AP4+ -
Demolisher 30cm AP3+/AT4+ Ignore Cover
2 x Lascannon 45cm AT5+ -
2 x Twin Heavy Flamer 30cm AP3+ -
Damage Capacity 3. Critical Hit Effect: The Banhammer's magazine explodes. The Banehammer is destroyed, and any units within 5cm of the model suffer a hit on a D6 roll of 6.
Notes: Reinforced Armour.Here the Wh40k stats of the mainguns of all super-heavy tank for comparison:
Vulcan Mega-bolter (Stormlord)
Range60" S6 AP1 Heavy15, PrimaryWeapon
Tremor Cannon (Banehammer)
Range60" S8 AP3 Ordnance1, 7"Blast, Earthshock, PrimaryWeapon
Plasma Blastgun (Stormblade)
(rapid)
Range72" S8 AP2 Ordnance2, 7"Blast, PrimaryWeapon
(full)
Range96" S10 AP2 Ordnance1, 10"Blast, PrimaryWeapon
Banesword Quake Cannon (Banesword)
Range24-180" S9 AP3 Ordnance1 Barrage, 10"Blast, PrimaryWeapon
Baneblade Cannon (Baneblade)
Range72" S9 AP2 Ordnance1, 10"Blast, PrimaryWeapon
Magma Cannon (Doomhammer)
Range60" S10 AP1 Ordnance1, 5"Blast, PrimaryWeapon
Hellhammer Cannon (Hellhammer)
Range36" S10 AP1 Ordnance1, 7"Blast, PrimaryWeapon, No cover saves allowed
Stormsword Cannon (Stormsword)
Range36" S10 AP1 Ordnance1, 10"Blast, PrimaryWeapon, No cover saves allowed
Volcano Cannon (Shadowsword)
Range120" SD AP2 Ordnance1, 5"Blast, Destroyer, PrimaryWeapon
Oh and also this thread:
viewtopic.php?f=74&t=14566&start=60