I've been running an old Eelco tank on my dragster and it was working fine with the carb setup, but it isn't big enough for the hilborn setup on methanol, so I think I'm just going to build a tank to fit down inside the rails of the chassis. What aluminum alloy is the easiest material to work with? Where can I buy it online? I'm also open to any other advice, I've done my share of welding and fab work but this will be my first try at building a fuel tank.