Finalising all the preparations in TH8 right now. As a new TH8, I’ll upgrade lab, dark spell factory, cc and DE storage asap. I’ll write out the reasoning in my TH8 guide 🙂
As you can see, most builders would be free around the time TH is complete so that I can start new upgrades immediately. As a rushed TH, this is not necessarily essential, but its helpful if you can arrange most builders to be free. As long as your builders are working though, you can always survive with slightly less builders free upon reaching a new TH level.
TH8! With all the new goodies 🙂