I dont know if you are really looking for an answer, but I'll try anyway....
While anyone who ever tried to configure DHCP on UCS for the first time will agree for sure that this is not one of the easiest tasks, especially when it comes to a apparently simple unrestricted DHCP-pool assigment, it is not too complicated when following the documentation.
Yes, I am still pointing to the manual because anything else will never provide sufficient information. The best opinion regarding Howtos I have heared this year was "Lest Dokumentation statt HowTos" (source: IPv6 auf Mailservern (Mailserverkonferenz, see p.18). I am pretty sure that I dont have to translate this for you.
Any attempt to write a Howto is always related to a very specific task. But how can someone willing to write one know about what you want to achieve in detail?
No documentation is perfect. If there is something which is hard to understand you can always ask here or ask directly per e-mail. I guess email@example.com should be the most appropriate address.
A book is certainly not a bad idea too, but it gets deprecated quickly. There are other reasons why Zentyal is offering this (trying to co-finance OpenChange).