Fucked up!!

The original tank that came with the bike ,was a good basis for a chopped fuel tank. There was still some fuel in it, but I let it out and put water in it. Then I emptied it and it was clean, I thought..
After that I started welding on the outside, this went a little bit wrong.. The fuel fumes gave an explosion and the tank became substantially bigger! I was lucky that the tank popped away from me..Shit!!!Now I'm gonna build one by myself from aluminium!