I had to do a bit of rebuilding on the scene, 2 hours of set up died in the physics calculations

I've reset the scene, worked on the floor texture, extended out the floor, set the bridge in a bit better, added planks, and saved. I haven't run the physics calcs yet, I'm afraid it may be a bit much for my comp; but then this is a heavy scene and I had been running carrara for a while, so a fresh load may fix it.