This paper reports on our experience working with a team of anthropologists to construct three-dimensional computer graphic models of Ceren, an archaeological site in western El Salvador, using inexpensive hardware and software. In constructing the model we discovered various ambiguities and inconsistencies in the raw site data and drawings we were provided. We resolved these problems by analysis and reinterpretation of the data, working closely with our archaeologist collaborator. What began as a simple exercise in rendering developed into a collaborative research effort to understand and interpret the source data. The process of computer modelling forced us to re-examine, analyze and interpret the information from the site.