It's a small board, just a bit bigger than a PD Buddy Sink v0.1.
Nothing unexpected, just pogo pins and connectors and two resistors
because it has a USB Type-C receptacle for power input.  The plastic
piece screws on and the whole thing should work just great, making the
SWD header unnecessary on the v0.3 PCBs.  It's even compatible with the
boot switch, and with a 2-pin 0.1 in. male header on the bottom as an
output connector.

It's a USB Type-C connector just like the one used in v0.1 and v0.2, but
with only SMT pins (except the fixing pins, of course).  They're
slightly cheaper and probably nicer for automated assembly, but
impossible to hand-solder.  That's okay though: where we're going, we
don't need hand-solderability.

There was previously no way of seeing where the business end of the USB
connector was.  To solve this, I added a crude outline of the connector
on the F.Fab layer.

Tested to probably not blow anything up if assembled properly!