More progress on the bed slide system - the frame is now complete with the slide hardware mounted.
Used some boards to hold the slides parallel while screwing them in.
Then the inner pieces that will support the shelves were screwed in 1/4" proud of the top of the frame.
And voila, the completed frame. This part weighs 114lbs, most of that is the drawer slide hardware. The shelves weigh an additional 54lbs and will be installed on the frame after it's bolted to the bed.
The total weight of 168lbs is comparable to paying a medium size man to squat in the back of the bed and hand me things as I ask for them, but I feel that the bed slide is a more economical and humane solution.
I assembled the "loose items" shelf using my kreg jig to make pocket screw holes - this is the one tool you need to own to successfully trick other people into thinking you're a competent woodworker. The shelf sides are only going to be screwed on, so it'll be trivial to reconfigure the slide in the future if needed. I'm also going to wrap the base with carpet and reinstall the sides on top. The sides are slotted so I can configure dividers ad-hoc as needed.
Both bases got wrapped with carpet, just stapling it on. I considered using an adhesive, but it would be a nightmare to remove when I inevitably need to refresh/replace the carpet in the future.