I received the printed backscene finally, after it sat in purgatory at ISC Queens for a few weeks. The backscene is from Model Scenery Supplies in Northrep. Overall, I think it looks fantastic, although there was a section with faded stripes due to an apparent printing issue, but I will be able to cut that section off.
Here’s a test photo:
Still needs to be trimmed at the margins, and I need to add a permanent curve in the corner, but it looks good already.
I also started building up some hills along the fascia. They need sanding before they are backfilled down to the level of the roadbed: