It depends on how heavy the Masonite is. If you used coroplast, you wouldn't need much more than screws. For the body side, you most likely have a pinch-weld that sticks down about an inch from the rest of the sheet metal. Drill and screw directly into the sheet metal on the frame side of the pinch weld. Use short screws no more than an inch long. That's an open area behind that sheet metal where you won't hurt anything. For the frame, one member here (AeroRV) attached a piece of wood to the bottom of his frame rails so he minimized the holes he had to drill into the frame, and could drill as many holes has he wanted into the wood, easily. Also, zip ties can work very well if the holes you have for attachment line up well.
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