MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
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In my case, i don't use heatbed at the moment. So I power my case with an external 12v 5A power supply.
In my tutorial, i show how to assembly the case, so i don't have wire the all 3D printer.
For information, I think that the better way to power the heatbed is to use a relay and not power it directly from the RAMPS (like this http://doc.3dmodularsystems.com/tag/heat-bed/).
idc connector : I thought about it, but the biggest ribbon cables (2.54 mm pitch) are only 28AWG when the motors need 22AWG. 22AWG cables can't be used with IDC connector (to big).