That looks great! That bottom edge should give enough room to get access to connectors on the UDOO.
I personally don't think you need two board connectors for Z (you can run both cables into a connector, or make up a Y-cable), but that's just my opinion.
I personally don't think you need two board connectors for Z (you can run both cables into a connector, or make up a Y-cable), but that's just my opinion.