That all looks very nice, layout, panel, transformer shelves, everything! That will be a fun layout for your young assistants! I have a volt/amp meter panel quite similar to yours, it looks like we may even have the same meters.
I think it's great that you are letting the kids help too. Even if it does take twice as long, it's worth it and is a great experience for them. It's also nice that they have some interest in it and are helping. I've tried to do the same with my grandson. I think they will remember it and also that you taught them how to do it.