I'm not really sure I understand what this is ... Is it a 512K board installed in a custom box and upgraded to a Plus configuration with the 128K ROM, and SCSI board? I don't see where the RAM has been upgraded though.

In any event if that's what this is, it's hardly a novel concept. From the debut of the 128K people were trying to figure out how to get a cheaper, lighter Mac, with a bigger screen. The build-your-own Mac was extremely popular option from the debut. This guy seems to have simply turned the concept into a local business.

http://www.vintagemacworld.com/ugly128.html