Ideally the message would be: "He has a life outside the internet but in the morning he's excited to get in front of his computer to build stuff. He also doesn't do side-projects so my contract will get his full focus and attention. He's got a family so he's probably won't work for sweat-equity only. We have to arrange some work schedule because he won't be available round the clock, but during those working hours he's really pushing hard to get things done." So now I just have to find a witty way to say that.
You're probably right it might not be the best idea to start with "caveats" (-: