For those who are modelling retaining walls in air drying clay (Das or similar) or plaster, may find this link useful. I have used this technique on my sons layout and it works a treat ! https://www.youtube.com/watch?v=nPfR9JD4Zkk A couple of pics from my own attempts on cast and scribed plaster, from 4.5 years ago... This could be used on Townstreet models as well. Cheers, Gary.