Robin,
And no doubt your methods for correcting your big goof will be instructive to the rest of us as well. We've all had goofs in our modelling efforts, and sometimes you just have to trash the whole thing and start over. That's part of the fun of model railroading, experiment with something and if it doesn't work, throw up your hands, say "Oh well" and move on.
One of the reasons I like to work with cheap supplies like balsa wood and cardboard, if I don't like it I don't have enough money invested in it that I feel bad about starting over.