I’m experimenting with lightweight diy shipping boxes.
Using Aluminium Plastic Composite / Sandwich Panel [1] or Corrugated Plastic aka correx [2].
Not used to make the boxes yet. I’ve got old sheets of the sandwich panel for sign shops from when they remove old signs from customers. They leave them by the bins and ask long as your dont leave printed signs dumped on the side of the road and de brand the sheets or hide the brand on the inside of the box, they dont mind.
The sheets have a few mounting holes but other wise excellent source free-of-feebies :) sandwich panels or corrugated plastic sheets. To recycle for a very cheap strong, lighter than plywood, box :)
Would be nice to go to fossdem for once and meet ya :) ... not sure how to manage travel... we see heh
[1] * a picture (16KB) of what a sheets construction looks like http://www.china-manufacturer-directory.com/picture/fireproof-aluminum-plast... * https://en.wikipedia.org/wiki/Sandwich_panel
[2] https://www.theplasticshop.co.uk/correx-sheet-index.html