Something like a sharpie to mark on the sheet metal.
Cold forming sheet metal with a hammer.
You have to adjust your mind to the concept that when you hammer on sheet metal with a steel hammer onto a steel dolly or anvil that you will expand or increase the surface area by thinning the metal.
And some sand paper to smooth out the edges.
How can you go about shaping metal with hand tools alone.
A ball peen hammer.
I used a 16 oz.
For this example we will hammer form some tank end caps.
You may want a smaller hammer for small shapes or a larger hammer for larger shapes.
The tokyo based goldsmith yutaka nagai demonstrates how to hammer down a gold ingot to form a sheet.
This is a handy metal fabrication technique you need to learn.
You also have to grasp the fact that you can reduce the area of sheet metal by thickening it.