I present to you, drawers! I'd say it took about 20 hours in build time, most of which was just perfecting the measurements and trying to make it as close as possible. It turned out amazing in my opinion, and I'm really happy with them. Definitely a big upgrade from my previous storage platform.
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I used 28" drawer slides, paddles latches, and 5/8" ply. For the latch, I used a door strike plate and notched out the bottom side, which worked better than I expected. It holds really well and doesn't wiggle at all while driving! Each drawer is about 15" wide inside, which seems to be the perfect size for all of my stuff.