Rob,
There are several books that do have some basic information about fuselage design.
One is Andy Lennon's "Basics of R/c Model Aircraft Design". Another book worth having is Martin Simons' "Model Aircraft Aerodynamics" (which I have just started to read). And another that might contain helpful information (I just ordered) is one by Jack Norris and others that is a two for one deal "Propellers The first and final explanation/The Logic of flight".

Also check out: http://www.airfieldmodels.com
Lots of thoughts on building and design there.

My feeling is the that a lightweight, rigid structure, that puts drag reduction at the top of the list is probably the most important design considerations. Also second to this would be reduction of turbulent airflow caused by the wing fuselage junctions and interference drag.

It is my understanding that a round (from the front) elongated reflexed teardrop shape is the best choice for a low drag fuselage...