When I was looking for a bot to bot 99 construction from 97-99 I looked into RSBuddy's scripts. All of their scripts should be safe, however I can't say the same about the quality. I tried both of the construction bots and they were worthless. It could not make Oak Dungeon doors for more then 3 minutes, same thing went with Oak Laders and Mahogany tables. I assume they were good at one point, however just outdated now. I ended up going with Rsbots.net AutoConstruction Pro. It works flawlessly, I would recommend trying that one.