Okay, maybe a new thread is indeed a better idea. I'd really like to create some string objects like guard rails, fences etc. but I don't know to what stuff I have to pay attention to, so that it works in BTB. I tried to make sobjects from things in another Xpack, but the guard rails don't line up: So, any advice on how to do it right? I don't want to use walls for guard rails etc. I want to have them a bit more detailed.