It is sure a great day and age to be alive with all the cool stuff that is being developed.
I had to chuckle the other day as I uploaded a part to Shapeways. Pricing showed ~$9.00 for the part printed in black plastic - and further down the list was the price for gold at $5300. That must be gold plated, one would think. Platinum was $15.500. Fat chance I will be ordering that.
To the point of my post.... After reading your post I wondered what process Shapeways uses to create there metal printed parts. If they to are just plated somehow, or utilize something like you show in your link. One day I will investigate this further. For now I was just curious.