I've tried to use as much as possible from my "scrap box". The aluminium components are things I cast from old hard disks back in 2008. http://workshopshed.com/2008/06/blobs-to-blocks-2/
The base was found dumped outside a furniture shop by Euston, I squared it up with a saw and surform before drilling, sanding and varnishing.
The arms were from an old garden parasol that had got worn out by the weather. I believe they are teak. They were planed and sanded to size before drilling. These will likely be left in a natural finish.
The 3D parts are designed using OpenSCAD and printed with a Cel Robox printer.
Designing and making the head - http://workshopshed.com/2015/03/magnifier-lamp-head/
Designing and making the thumb-wheels - http://workshopshed.com/2015/03/thumb-wheels/