He's got a small wooden template to ensure the correct radius on the inside and outside of the staves.
The staves are laid out to measure the length of steel needed for the hoop.
Making the holes for the rivets.
Raising the barrel.
At this point I was told to "Put the bloody camera down and give us a hand!" so there are no pictures of the next bit which involved a fair bit of struggling and grunting. Coopers swear silently as the expletives used are too disgusting for the human ear.