Here is a link to simple volume models of the body parts for 17 dinosaurs. They are apparently intended for studying the biomechanics of dinosaurs that evolved into birds, but might make accurate starting references for more detailed models. They are in .obj format and import easily into Blender in the correct relative positions.
Reference: Allen V, Bates KT, Li Z, Hutchinson JR (2013) Linking the evolution of body shape and locomotor biomechanics in bird-line archosaurs. Nature, online in advance of print.doi:10.1038/nature12059