I started working on the prototype tonight, armed with a general idea of what I wanted (and that included not wanting to do 24 connections on 16 different chips), I started tacking two sets of 8 SRAM ICs together. once both sets were all tacked together, I went thru and soldered the other common pins together. After getting the two sets of SRAM together, I decided that I should hammed out the memory decoder/demux so I hammered out a quick schematic based on the memory map I had created earlier

tomorrow at some point, I will scavenge around to locate the 4 7400 series ICs that I need and start to assemble the board.