Code Sample:
STORMHAMMER (FLOGUSUS PATTERN)
Type     Speed  Armour  Close Combat Firefight
War Engine  15cm   4+    6+      4+
Weapons               Range  Firepower     Notes
2 x Snub Battlecannons Turret   45cm  2x AP4+/AT4+   -
4 x Heavy Bolter         30cm  AP5+       -
Defensive Boltgun Array      (15cm)  Small Arms    Extra Attacks (+1) (or +2 ?)
Damage Capacity 3. Critical Hit: The Stormhammer’s magazine explodes.
The Stormhammer is destroyed, and any units within 5cm of the model
suffer a hit on a D6 roll of 6+.
Notes: Reinforced Armor, Thick Rear Armour
Speed 15cm : this tank is heavier armoured than others SHT (thick rear armour), but it's weaponnery is more 'primitive' than on others SHTs : plasma reactors for Stormblades, big accumulators for the Volcano of the Shadowsword, loads of mega-battlecannon and demolisher big shells, ...
Side sponsors : from lascannon & heavy bolters to heavy bolters and arrays of bolters. 4 lascannons will makes the Stormhammer to powerful IMO, and I see Stormhammer as a short range tank or even a FF-tank (so is the FF extra attack).
And the un-twinning of the snub battlecannons is for giving the Stormhammer an antitank capacity even with the removal of the lascannons.
FF3+ => FF4+ : FF short range capacity already represented by Defensive Boltgun Array.