That's the model Scott built sitting on top of the box in front of him. Here he's painting one of the landship's many canon's as he and his friend Matthew talk shop. From a size standpoint some of those that build scale models, might look at this tank he calls "The Waaaghsa" and not find it visually imposing in stature, but when you consider Scott built this model to scale in every detail, so it can be used in real Warhammer battles, it's actually a massive creation compared to most war weapons that it will face in combat. And he won't have far to travel to test it out in battle, as Games Workshops stores serve as a community center with large tables set up both for the building and painting of all manner of Warhammer creations, and more tables next to these that the participants can then do battle on.
Unlike many games the Warhammer creators don't command absolute control of the weapons used in their game, and encourage their members to combine and create vehicles and weapons that suit the needs of the armies that use them. Even following the guidelines necessary to incorporate your creations into the well setup rules of combat in Warhammer, the only limit to what you can create to use in battle is determined by your imagination, and if there's one thing Scott has in copious amounts it's creativity.
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