Making an aluminum gas tank - part 2

I continue my quest for an aluminum gas tank for my Ducati cafe racer. Never having done this before, means there is a lot to learn. I’ve started making the buck that I will use to build the final tank. Im not doing this the fast way, but I Iike to do things my own way… I am making a very solid buck using plywood and oak, to be able to shape the aluminum against it without destroying the shape of the buck…