Julius de Boer did some review on the assembly of the full metal extruder http://www.juliusdeboer.nl/reprapworld-cold-end-extruder/. He also made a bracket, so you can mount the body to a Prusa I3 http://www.thingiverse.com/thing:142725!
ReprapWorld is the number one webshop for all your reprap supplies for your 3D printer. We have a large collection of 3D printer components, from our famous electronics lines to filament from our own production. And everything is at a very competitive price!