Good Morning All,
I decided to build my own Tunnel Portal as to buy this one is way to expensive

Timber Portal from Woodland Scenics = $10.79 + $16.86 for shipping !!!!!!

Timber Retaining Wall from Woodland Scenics = %11.75 + $8.34 for shipping......
So, I'm building my own. Cost is about R50 for the glue and blade I use

And my time, will, I'm having fun so who care....
I have one on my layout at the moment so got the basic dimensions from that.
Pic 01 - is the one on my layout.
Pic 02 - is my quick drawing on Paper
Pic 03 - is the transfer to the PC