Finding Green Tea Tin

After consultation today,
I was asked to get a real Green Tea Tin to proceed my 3D cube.
( At first I want to do myself one )

The tin can get easily at everywhere,
but,
the major problem is,
I don't know how to cut the tin nicely.
That's why I want to do the tin myself using paper.

But,
still,
I need to give it a try.
Maybe ask my friend demo to me how to cut.
:P