I contemplating of maybe doing a taking further taking the blocks and further breaking them down... Things like the registers should be pretty straight forward with a bunch if parallel D-Latches with a few enable lines.

I was looking at the decode rom on the 6507 schematics , but the markings they have at the junctions are strange. They are half filled circles where the line is, I'm assuming, to be zeroed out. I'm also assuming they are tying to represent some kind of drain transistor there...