Look up your local fabricator/welder to cut the top. That's what I did. I went by and offered the first dude I saw a 12 pack of beer to cut a 12" hole, and with a plasma cutter he had it done in about 15 minutes.
As for the spigot, it is REALLY easy to do with a step-bit and a drill. I did my keggle in about 20 minutes without any experience, then did a second kettle in about 5 minutes with the lessons I learned from my first one...
Do a forum search for installing a weldless fitting or making a keggle and you'll find hundreds of examples and tips.
Primary #1 - Midnight Ryeder (Midnight Wheat and Rye)
Primary #2 - Florida Weiss
Primary #3 - Kane-DOH APA (Honey Citra APA)
Secondary #1 - Downtown Flanders Brown (brewed August 2012)
Keg #1 - Raspberry Florida Weiss
Keg #2 - Cinnamon Raisin Cider
Keg #3 - NONE!
Bottled - NONE!