I discuss the steps on how I built this custom 0-96 curved bridge for my O Scale layout, the Peabody & Merrimack Valley Railroad. I used Masonite for the sides and balsa wood strips and styrene strips for the detailing.
Be sure to check out Nick L Trains
https://www.youtube.com/channel/UCwDINm0CMnyTQRhEF6oQYfg
Be sure to check out my Facebook channel for more updates on the P&MV:
https://www.facebook.com/PandMVrailroad/