I've been studying up on the subject of resin casting and am considering making some relay boxes for my small n-scale shelf layout. Attached is a photo of the prototype box on the local RR. After completing a scale drawing, I now realize how darn small this thing is in n-scale! Now I'm wondering how to make an accurate master? I was originally thinking of sheet styrene, but the fine details have me stumped so then I thought about sculpting instead. My wife recently did some work using Super Sculpy polymer clay that is sculpted then baked to a hard finish. Has anyone tried this material to construct a master for resin casting and if so, how did it work out?