It works and looks good - in my eyes anyway!

The tunnel scenic sub-base works! Well the main construction is now finished following on from the tunnel mouths being glued to the main sub-base and the top where my card board butchery hacked a part of it away has been repaired. That bit was fairly easy as I was able to lay a piece of card under the affected main structure and trace around the 'hole' to give the right shape to cut from the new card.

With that cut, it was simply a case of gluing it in place.

It was then time to glue the tunnel mouths and tunnel insides to the sub-base and strengthen a few other parts of the overall structure.

Left a while to allow the glue to dry, the sub-base was then transferred back to the layout to finally see, for the third time, if it looked OK and that the rolling stock passed through without issue.

I am more than happy to report that it does look good and the rolling stock goes through and pass without issues! Phew! Looking from a distance it does fit in even better with the overall scene now.

So, now it is back to building new top walls and parapets, as the the ones I built for the first design of tunnels no longer fit!