For the  power-bus I made two a bit smaller rings that will be put inside the other rings, behind the ICs.  The spacing between the GND and VCC rings are 1.4" so they can end up siting exactly behind pin 14 and pin 28 of the memory ICs.

They are helt together with a couple of 100nF caps and a 470uF bulk cap. 

I also added a power LED in the ring, debating with myself if I should use a blue (kinda cool but utterly crap looking for anything retro), so I selected a non-clear red LED.