This is my Fire Prism, painted in my usual Saim-Hann scheme. As you see, the striking difference between the off the shelf model is the converted "old school" prism cannon. It looks more like the old model and I think it compliments the proportions of the tank better. Basically I cut of the barrel and shortened the crystal in the muzzle with a modelling saw so it looks like a one big, integrated crystal. Also notice the converted Holo-Field generators that were made from a piece from the Wave Serpent sprue.