I also have a suggestion. There is an under utilized feature when a topic is created called tags.
Here is how it could be used. There would be only one automotive workbench for all scales. When a topic is created it would get a tag big or small. These tags show next to the title. To see only the big scale the big tag is touched. To facilitate the usage a pinned topic would have an appropriate title. Then the tags could be used to filter out a specific type. By doing this we will use something that already existscand avoid having too many sections that don't always get the right items put in them anyway. Just a thought.