How to set transparency and shadows over glass in monochrome

[orei]

Hi my friends, i've done a sketchup style based on monocrome style, because i need to have also a texturized model. I don't wanna do multiple file because everytime change anything, need to change in any file..

So.. there is a simple mode to set the transparency available in monochrome style (i've edited the two side of the faces) and to see the shadows over the windows?

Thanks a lot!!!