OK, here's some info. First check the Flickr set
The monopod is composed of three basic parts: a camera mounting head and two expendable window cleaning poles.
The head is some cheap Hama model and allows rotating and tilting the camera, I hope the photos shot this.
Each pole is 1.5m high and extends to 3.0m. When extended it fastens via twisting the inner and outer tubes in opposite directions.
The two poles can be joined together for a total lenght of 6 meters. At that height the monopod is not exactly stable with the 5D + Sigma 24-60 on it (you can see the bend on the photos), but I rarely need such height and shooting at 1/1000 does the trick (and I'm probably getting a Sigma DP1 soon - had it for a week to test this and that). Shooting is done remotely, via wireless remote
Joining of the poles is done by a custom machined metal joint of two parts (sorry, not sure of the exact technical names). This joint is two-part: male with a bolt and female with a socket, you can see those on the photos
. The joint is sturdy enough and was made to fit the pole's tube perfectly.
In the image set I've posted some photos of my father holding the monopod up and sideways, as well as three actual "demo"-shots.
Gotta run now, if you have any questions - post them, I'll try to answer later!
ps: I'll add the costs for each component later.