Although it's a Work In Progress for over 3 years already, it will be finished some day, so lets make a topic about it.
I've been working on a unimog wheel based four axle mobile telescopic crane, the Liebherr LTM1100. The undercarriage is already standing around in semi finished condition for quite some while, waiting till I got inspired again. And while I was tearing down the 42009 I got my inspiration back! Since then I started building the superstructure and crane boom. Because of the scale I was able to make a four stage telescopic boom without making one or more of the sections look out of proportion. This posed a nice challenge, and I think I tackled it by now. At full extension, the boom now reaches to about 2,5 meters. In the pictures, the top part reaches past the ceiling actually.
Boom by Thomas Joling, on Flickr
Boom by Thomas Joling, on Flickr
And a video I made this morning, testing if the mechanics for lifting the actual boom were up to the task:
As you can hear, they are not, but we'll fix that :D
For other pictures, head to the flickr album
If you have any questions, put them below :)