gas tank

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I have an idea to weld a custom gas tank for my Mountian Cat. To save weight and to add strength I would incoperate the frame from steering post to tunnel into the gas tank as I would get higher volume and double tank as structural. What is a con to this and has anyone ever tried this?

Updating a '99 Powder Special 600 with a 1M tunnel and a 1M Boss seat. But I thnk I need a 1M gas tank to fit the seat. Which 1M tanks will swap in without much if any work? Any 1M EFI? Thanks in advance for any help.

i have a IQR headlight and wiring, rear grab bar, and gas tank(the race one) for sale. if anyone is interested pm me. thanks