Hi Jeroen,
Before I start, I'd like to say that your crane looks very impressive indeed! Do you still have it built?
I've been starting to look at building my own very large crane, and considering the Liebherr LTM 1500-8.1, which has many similarities to your crane. I wondered if you had any more pictures, or information that you wouldn't mind sharing with me regarding your solutions to modelling such a beast? I am particularly interested in the 4 part boom, although that might be the bit you don't want to share?
I have not started yet, and will probably build in in software first, so I can get an idea what extra bits I might need.
Cheers,
Bill