Not a hugely productive day but I did get the angles worked out and the abutments cut. Laid out on the floor it begins to look like a biggish bridge.
The next step, and I hope the last difficult one, is cutting the spacers and getting the vousoirs set up parallel and square. After that it should be relatively straightforward work to dack it and put on handrails. I doubt though that we will get that far tomorrow. We will have to see.