The basic construction of the plotter consists of a thin wooden plate (3mm) which is glued onto a thicker wooden frame to increase the stability while being not too heavy.
All the mechanic stuff is from http://openbuildspartstore.com/, it's not to expensive and even if it's IMHO not best quality it does a good job as far as I can judge. Also this saves on brain which is needed for the programming part.
The electrics consist of a teensy and SilentStepStick TMC2209 drivers. I guess I'll need the raw power of the teensy because efficient programming is out of my league.
The initial alpha firmware can be found at github.
This is how it looks at the moment:

This is so cool! Would love to have a wall mounted mini version of this - it'd be as much of an art piece as the resulting drawing!