At the bottom of Getting Started – PCB Builder | DigiKey Electronics there is a list of “Standard Board House Specifications”. There are some key parameters missing for DkRed:
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Thickness of the lines used to draw the board outline. Does it need to match the router bit, or do you route to the middle of each line?
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What clearance is required between pads and solder mask (aka “solder mask expansion”)
I would suggest looking at the design rules in Eagle or KiCad for a complete list.