need help to hide a bridge intersection

[Biased turkey]

After more then 1 year, my 23" X 11" switching layout is almost finished lol.
My bridge intersects both left and back backdrop and I wanted to hide both ends where the bridge intersects the backdrops.
I built a brick structure to hide the left side intersection, but I don't know what to use for hiding the back end of the bridge.
Any suggestion is welcome.

Jacques