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Boolean not returning valid part
I have a boat that I'm trying to model based off of four lofted sketches. I've been trying to hollow it out; I tried using both shell and thickness to do so. In either case, whenever I try to take the top of the boat off using any sort of boolean operation, I get an error. In this most recent iteration, I've got a 10mm thick shell, and when I try to get the intersection with a block I've extruded underneath it, I get an error. Here's the link.
Why? How should I make it differently?