I built the same one. Works great! No, they aren't water proof but I plopped a plastic boot tray over mine with some bricks and now it mostly is
Oh, and I made mine narrower than the plans otherwise the boot tray wouldn't be working so well. Didnt' plan it that way, is just how it worked out.

Oh, and I made mine narrower than the plans otherwise the boot tray wouldn't be working so well. Didnt' plan it that way, is just how it worked out.
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