I'm building a JGRO in Cologne, Germany. As I wasn't able to find any metric plans I'm doing a sketchup right from the scratch. Alternating to that I'm trying to source parts as cheap as possible.
The plans should be done at the end of the week, so if you were interested I could pm them to you. Otherwise I will post them, when I'll do my building blog - aprox. in mid February.
Did you start your project yet?