In my experience of orky scratchbuilding, always sort out the tracks/wheels first, and attach them to a nice sturdy box of plasticard (to get the approximate vehicle width and height right). Then add all the fiddly shapes, starting with any looted bits (e.g. turrets and/or weapons) with fixed sizes. Fill in any gaps with more plasticard 'armour'. Then add fake rivets galore.
The Mega Grot Tank looks far more tank than ship, so a model/toy tank would also be an easier conversion base than a ship. I don't see any listing of the Mega Grot Tank's size, but judging by the crew size, I'm guessing something like a 1:35 medium tank (e.g. Sherman or Panzer 3) or 1:48 heavy (e.g. Tiger) would be about right. Try to pick something that _doesn't_ have immediately recognisable road wheels and suspension, so that the final model will look more orky and less "converted model tank". Check out your local toy shop too, but be careful with toy plastic - it's often not polystyrene and can be difficult to cut and glue and paint.
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