[Radiance-general] ecotect export - missing surfaces

[Nick Doylend]

I'm having some problems exporting geometry from Ecotect - I'm trying to
model some external shades.  I've tried to build them up as 3D surfaces
but when I export and render only the two side pieces are visible, the
small top, bottom, back and front faces do not appear.  What am I doing
wrong?

http://ndoylend.fastmail.fm/temp/test_c.png

The rest of the Radiance/Ecotect files are in the same directory if
anyone wants to take a look.

Thanks for your help,

Nick