How close to the ground will the bottom of the box be? Is it the lowest thing on vehicle? If you high-centre the truck, will the box be against the ground?
If it isn't in a particularly vulnerable position, maybe it doesn't need much protection. If the Volt modules are upright (in their usual orientation) and mounted on the stock base plates, they have some protection from whatever might penetrate the box.
It will be at least 300mm above the ground. The lowest point is the the rear suspension arms at about 160mm (same for any T4 van) and the same in the front for the sub frame. I had thought to possibly make a thin stainless "baking pan" to put up around the box.
The Volt mounting plate is reinforced with high strength steel. Also, it's very convenient for mounting the modules. I cut mine to sizes I wanted and welded them together. Just don't try to drill thru the reinforcement channels!
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