Hi !! I'm trying to build abutements for my N scale bridges (Atlas plate girder) and I have a couple of questions: 1- What material should I use to make them ? I'd like to use plaster but I was unable to cast it in the shape that I'd like (a simple rectangle) the shape is never straight or regular. Any tpis ? I've resolved to do them in styrofoam (the blue one) by just coutting them out of a block with a sharp x-acto knife... Looking for suggestions ... 2- Color ? The abutements are made of concrete, but I can't figure out any ways to make them look like concrete. I'm just back from the hobby shop and bought woodland scenics concrete color (was looking for floquil aged concrete but they dont carry floquil) and I am *VERY* disapointed ... the color is very far from the concrete I know... it looks like sand, it's tan rather than the light gray I was expecting ... I'm now turning towards my acrylics where I think I'll be able to mix something better. Any suggestions here ? Thanks !!!