Here are some beginning links that might be of assistance to you which I have culled from prior offerings by other respondents to the T&A area.
http://www.uark.edu/staff/drp/
Try www.drj.com - the Disaster Recovery Journal is dedicated to the whole issue, they sponsor training sessions, they have conferences, books, journals, everything you need
http://www.drj.com/new2dr/samples.htm
http://www.disasterplan.com/
http://www.cio.com - search for disaster recovery - numerous articles from the upper level perspective.
Also keep in mind that the term Disaster Recovery has morphed into the area of Business Continuity Planning and thus other resources become available under that topic, particularly when your addressing the enterprise level scope your expected to deal with.
Also DRP involves multiple disciplines, HR, Operations, Finance, etc. again depending on the definition of the DRP proposal request.
I might have some reservations on doing a bottom up approach. Itseems to me that it would tend to limit or potentially miss the complexities and dependencies that exist in a complete multibusiness unit enterprise. While you would certainly and ultimately address all the lower levels starting from clear understandings of business scope, relationships and business process processes would be required early on.
Would be interested in your findings and progress as this is a challenging assignment.
p.s. widen your search for disaster recover to all of tech republic - as this topic has been discussed in a variety of areas for quite some time. Haven't seen the plan sample or the plan outline just yet, but if you find it let me know.