You can see in my build (Der Froschkönig - Lowrider 3 in Oldenburg, Germany - #64 by Tokoloshe) where I put most of the screws (you might also want to put some on the other side), but there is enough clearance. You could also cuntersink them a bit. I also actually left more space in between than the 20cm I said. 
But not a lot.
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