I used pine, but did not pocket hole the top together to allow for shrinkage. The stainless trough was made by a sheet metal fabricator friend of mine. It is tapered to the center with a hose connection and shut of valve attached. I am using it and everyone who sees it wants me to make them one
The cost was $75,00. for the lumber and screws The trough was free, but it would have cost $375,00 if I had to buy one!!