Next steps:

• I still have a number of projects to test - documentation is going to be the biggest time challenge.
• Modifications for the Sensors / Outputs board - need to spin up a new PCB.
• Once everything is working create a BOM / PCB files / some kind of basic instruction document.  Ultimately this will be a big task to replicate the original manual from Radio Shack, which was very good!
• Finalize design of overall box - most likely laser cut from wood.
• Start Phase 2 - Digital logic circuits!