Where could I download all the stuff required to create the arm?
The uFactory guys have accommodated me royally... they sent cad drawings and a parts list. I found a local laser cutting guy who is making my parts in the next couple of days. My job's next in his shop. EDIT.... my cutting is done, I'll collect Monday 
You def don't want to buy a cutter, pretty sure that's beeeeeeeg dinari, but my guy's doing it for 600ZAR... right now that's about 60USD, 40GBP more or less. He's doing it in black Plexiglass aka Perspex.
All the other parts are commercial: bearings with standard part numbers, standard M-series screws. 3x standard servos, 1x tiny one.