4th generation of my printer line and probably first one mature enough to fully publish.
AND IT IS DONE: check relased files and instructions on thingi. RepRap.org update will follow, waiting for feedback.
The basic idea is to enclose the print in a solid, rigid box. And just put everything you can outside. You can then add a second shell for aesthetics... or not :)
all except the warrior printed on the machine
Aluminum composite shell body - did you notice how a simple cardboard box is rigid while assembled - same principal
closed chamber - after installing front shield
15x15x15cm working volume
25x35cm footprint - plus Z contraption
yegahD extruder - 
single head or multiple with bowden
nema23 for Y and n17 for other axes by default
12mm glides - uniform, stainless, aluminum or just some cold forged pipe.
slide linear bearings
bended aluminum single piece Xcart
only ca. 200g of printed parts
enclosed PSU and electronics - single ATX and Sunbeam/Teensylu in this case
plywood and molded versions to come
parametric openSCAD design
ultra easy to correctly assemble and cheap to build
after installing front shield only small openings remain. with no extra insulation and no extra heating except the bed it gets to almost 50 degrees Celsius inside (about 30 outside)
next one will be large volume and "bed on the Z" type, but I wanted to make ultra cheap and easy to assemble one first, with minimum impact on quality.