These people Valtoron Motorcycles were present at the Mula Fest in Madrid. The bikes they had on display were (and still are) top notch customs, covered in home made custom parts, a lot of which were cast. The guys were demonstrating casting techniques at the show with a makeshift casting setup. This video of the action was created by Photographer/video'er/sidecar monkey Kristina Fender. Check out the video and Check out her website, and her motocycle based photography blog.
The Valtoron lot don't have a website.
Valtoron Motorcycles from kristina Fender on Vimeo.