How can you make Irish cream liqueur from scratch?

http://www.seriouseats.com/recipes/2011/11/diy-irish-cream-homemade-baileys-recipe.html
this one uses powdered espresso and cocoa powder, but it says in the notes that you can use brewed espresso instead. That said, the use of powdered coffee makes sense if you're trying to keep the water in the recipe to a minimum and the flavour as pleasant as possible.

Here's an easy recipe I found recently: http://thewholekitchen.wordpress.com/2009/03/01/diy-irish-cream/