Yep, that's how it's wired. Fortunately all the pins needed line up - most of the pins are there for physical stability and I've got cut-off headers to support the Pixl.js (top right of the board) where the header goes mad :)
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Great! For anyone else considering this, you basically wired it like this? http://www.espruino.com/Pixl.js#serial-console
If only the Arduino headers were all 0.1" pitch ;)