Hello!
Some years ago I made a miniature version of the 8868 classic technic set. It's a 1:2 scale model of the original set.
The pictures could be better, but I made them in 2010, back then I didn't care much about lights and background.
Original:
http://www.brickshel...y.cgi?i=3727866
My version:
Folder: http://www.brickshel...ry.cgi?f=429085
I tried to make a model also of the V6 engine:
Like the original, it has a pneumatic compressor:
You can control the small pneumatic cylinder which can raise/lower the claw arm in the back with this pneumatic switch. In the original 8868, this switch is placed similar.
(there are sticker copys about the original's stickers to show the arm's positions)
You can steer it with HOG, and a micromotor drives the vehicle (unfortunately back then I used a cutted piece in the drive shaft, but it can be made with regular Lego pieces - I"m planning to make this mini 8868 again in a better way)
Of course, it has cables for powering the compressor's 71427 motor and for the micromotor. The claw arm can be only raised, and a small rubber band is responsible for the backward movement:
With the small 8t gear in the right side of the cabin you can rotate the upper structure. This is the mechanism to make it:
http://www.brickshel...y.cgi?i=4453741
Video: