Finally, all the pink foam is in place. The top pieces are still pinned down, waiting for the glue to set. But on the lower layers I have started to fill in the gaps with a spackling compound.
Here is a panorma view. The perspective is a little funny. That is beacuse it is really two pictures, stitched together, and they are taken at different angles.
You can click here to see a larger version.
And here is a close-up of the tunnel portal, where I have started to form some rock around it.