...........after some lunch I went back and laid-up a a couple of layers of 400gsm mat.
This took a couple of hours but the pictures are a bit boring.
This afternoon I returned to start peeling off the wood and the foam and I was really pleased......this is the back.
The side before the original edge is removed.
I trimmed all four edges back to the new lip.
There is now plenty of shoulder room in the driving position which makes life much more comfortable, and there is good space between the steering wheel and the edge. The edges are now in the same plane as the side bars in the frame (and at the front and back).
All in all, a result.