Tags are used to show or hide the objects in the model space. To keep things separate so they don’t “glue” to each other, you need to use groups or components (objects). Since the panels are pre-manufacured and shipped to the site, and the document is to show assembly of the panels, I would make a group or component of each panel and give them tags to show or hide them depending on what you require for a given scene.
In addition, if any panels are identical (not unusual, I think) they should be instances of the same component and given instance names to identify which is which. That should actually help assemblers, as it makes clear that there are multiples. Don’t you hate it when the instructions say there are 10 bolts needed and the kit contains 12?
To help achieve your goals, some time spent at the SketchUp Campus and at the SketchUp - YouTube channel will be very worthwhile. Both sites are from the SketchUp team. On the YouTube channel, pay attention to the Square One Series and Level UP series. They cover the basics for each tool.