What are good data on the Human Metabolic Model and where can I get them?
As far as I know, there is no one model officially known as "the Human Metabolic Model", but the Recon 2 model, described as a "consensus" model and the most comprehensive to date in Thiele et al. 2013, A community-driven global reconstruction of human metabolism (http://www.nature.com/nbt/journal/v31/n5/full/nbt.2488.html) is available at http://humanmetabolism.org/?page_id=75

Tissue-specific models are also available. See for example  Wang et al.:  Reconstruction of genome-scale metabolic models for 126 human tissues using mCADRE. BMC Systems Biology 2012, 6:153: