Let me respectfully suggest that you should study on this a bit more.
You don’t need any more “juice” for multiple blocks as in the diagram above. Each separate power pack still only controls one train at a time. That is the whole idea. Your tech II would still be useful.
So trains would never move between one of those areas and the others? Seems pretty limiting to me, but if that is OK with you, OK.
Well if you just want unconnected ovals, what you are describing will work. If you want trains to run on the main line and then go into the yard and back, using blocks the normal way will be more flexible.
I will stop bothering you with unwanted suggestions. Good luck.
That was done by Soo Line fan on this thread