You may have already gone this route, but I would suggest placing the battery box below the engine compartment floor as is done in the later built units. I used 1 X 1 SST angle to do a battery box for another coach, and it worked out well. The frame can be linned with SST, or poly, and the top with clear plexi or lexan. If you make the box water tight be sure and install drain holes and venting.
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