http://hands.com/~lkcl/3dcase.tgz
worked it out. there's a function "projection" - the resultant output needs to be opened in openscad then manually exported, it takes forever but i ran it the 5 times needed and produced 5 DXF files. assuming 1mm veneer:
layer 1: qty 2 needed (touchpanel surround) layer 2: qty 2 needed (lcd and pcb inset) layer 3: qty 3 needed (component surround, microsd) layer 4: qty 4 needed (component surround) layer 5: qty 1 needed (lid)
so those are 2.0mm, 2.0mm, 3.0mm, 4.0mm and 1.0mm
the files may actually contain more than one part (as there are gaps) so they may need editing. also i noticed i got the holes just above the micro-sd... also i realised i need to modify this to take into account the capacitive panel cable *sigh* but it took so damn long to run i'd be happy to modify the layer by hand.
let me know, joe, if the dxf files are good for the machine you're using.
They look OK, I give it a go - probably have to cut and glue the parts with lots of hollow insides into 2 or more pieces to avoid wasting material - or lap them etc.