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Tell me how terrible my PCB layout is!
I've been working on this board layout and would like some critique and feedback. If it sucks, tell me how much and what I should be doing instead! 
I don't have a great deal of experience laying out boards and this is my first 'proper' complicated layout - everything I've done before has been fairly trivial and much simpler than this.
The line down the middle is where the board is intended to be split, so I end up with two boards that will be stacked (with component sides facing). By the way, ignore the grey traces between the 14-way headers in the middle, I had to put jumper links there to satisfy the ERC - they will actually be a ribbon cable when assembled. Might have it v-groove cut at time of manufacture, or maybe leave it whole and cut it myself - depends on cost (I know many PCB makers want to charge you extra for 'multiple' designs, which this isn't really, but who knows what they'll say). I would have made it a routed slot with break-away joins, but that would make the whole thing >100mm wide, which unfortunately puts you into a higher pricing bracket for a lot of PCB manufacturers.
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