It's not usual to see that kind of technic creations that mix full of functions technic core, relatively small scale and a Lego "system" exterior, this is because it's not easy to build with that construction requirements.
SFRIP has done it with honours with this two models seen in the past Catbrick 2012
The images are self-explaining but note the large amount of functions, the scale and the aesthetics that this models have:
Mobile crane
Crane truck
There's some more images at SFRIP's photostream on Flickr and other several interesting creations.
