Well, finally I did it. Last week I did a lot of home improvement. I got rid of the LCD and am now playing WOHD (besides watching movies and stuff) on a 100" projector + frame screen setup. The room is not yet optimized (walls and ceiling are still white and that's bad for a projector setup) but this is the next project.
It's near full immersive WOHD playing on this size @ 3.2 m distance, but to date I do not experience any motion sickness. Well, I think it's even better than on the 52" LCD.