Thanks for the info, Ill get Tradas decking manual and see if I can make sense of it.
I dont mind spending time developing the software. I’m currently using Sketchup and it’s very good but time consuming if you want to include all the details. I’m thinking of using a program called Unity, which has some great 3D development/workflow tools. Its primarily used for designing games (which I used to do back in the day). Well see!!