I could have one of my books sent to you from Sydney if you like.
The main problem with your LightWorks rendering is that the Camera Light seems to be on. CAMERA LIGHT BAD.
Materials look different in LightWorks because they have all sorts of special reflectivity settings than other rendering methods provide.
Who said that the default LightWorks light settings were any good? There you go trusting Graphisoft again when even their own instruction material shows black soffits.
Get in there and fix it, both by reducing light intensity and reflectivity in the materials you used.
Dwight Atkinson