That first picture looks like a slide in tray for a rabbit coup poop catcher. We used those exact fronts on a Demon recently. They fit nice, Set them in traced around them and left a 1/2 inch lip on the original floor. Then fit the pinch weld in the front nice so we clamped them there and screwed the rest down. welded them solid removed the screws and welded the holes. Afterward we seam sealed the underside. and under coated them before paint.
Is that first picture of the rears from the same company? If so I'll tell the guy not to get them for the rear of the Demon.
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