Gas Tank Blazer style install

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Bought a Blazer style gas tank. After playing with it for a few minutes I figure out it won't sit inside of the Botton rails. I bolted it to the bottom of the rails. I had to do some trimming on one corner to make it bolt up. How do the straps hook up ? IF there any pictures out there that would be helpful. It looks like it going to work ?? Bolting the tank on the bottom of the frame rails the right way ? Waiting for the wood for the Bed removed the old. Made it easier to play with the tank. Tank in question is from Truck shop. Am I going about it the right way ?