Hi Jim,
Thanks for posting your image of the breadboard setup 
I also stumbled upon DIY Layout creator - my main schematic has the Splitboard in it - I used Adobe Illustrator to create the full schematic - Tom asked if I could edit and make things cleaner - so I created a Splitboard in Illustrator.
I agree with you on DIY - its easy to use, especially for beginners. I find it interesting it came out of needs for guitars and possibly Amps?
I found it a little buggy on my Mac - do have a PC too for Solidworks, but that box sounds like a Cessna idling on the tarmac - and the Mac has the newer ARM chips and is whisper quiet.