Fuel Cell mounting

[MZ 500]

I am looking for ideas for mounting my fuel cell I would like to keep it low in the trunk but I am open to anything there are no pans in my trunk right now just the sub frame rails so I can do just about anything. Here is what I have for a fuel cell and I also attached a pic of an idea I modeled up. One thing I was wondering about is should I have it incased in a sheet metal can or is it ok to mount like this?

http://store.summitracing.com/partde...5&autoview=sku