Tom Keddie shared his Zero project using a xQFP80 +50 Protoboard:
I need more processing power than an AVR for an upcoming project so I ordered an Arduino Zero to take a look at the SAMD ARM processors. Unfortunately my son coveted the box it came in, once the two were separated the Zero was never seen again. I had separately ordered the processor part, I realised I could build a Zero using a spare DP xQFP 50/80 prototyping board.
The schematic is fairly simple, doesn’t even need an external crystal. I was extra pleased when I realised the 1.27mm header fit the SOIC pattern on the board.