Hi, it arrived. I took some pics but can't post them for a few more days.
The top is similiar to an Amiga 500, and must have came from the same factory.
Inside there is an custom 8086 motherboard about 10 inch by 10 inch. It has one ISA slot. An internal floppy. No hard drive. The keyboard is plugged in via and internal AT connector.
It should give some inspiration for making you own custom case.
I would call it a PC version of an Amiga 500.