Here is a link that might be useful: Fish Pond
lol....I think it is a lot easier to buy a plastic liner for a whisky barrel.
Thats what I did about 6 or 7 years ago...it is still holding water.
And it is just the right size for my flower garden.
The tires look like they would work okay....but did you see him hanging over the edge, head down....this old woman just couldn't do that anymore. I'd have to call for help to get up and out.