First step in any natural disaster is to survey the damage:
OK, that's what I did today: Take pictures. After that, I had no idea how to proceed, so I went upstairs and took a nap.
I could start by throwing the empty boxes away, but that really should be the last step, after I've sorted everything out and put what I can in that nice selection of boxes. A good strategy would be to pile everything that gets thrown away, everything that should go down to the garage, everything that stays, etc. but there isn't enough room available anymore to make the piles. Another possibility would be to simply abandon the property and live in the teardrop.
The real problem, of course, is that neither Shelly nor I can throw anything away that might be useful. So I started small. We had three boxes of used disposable brushes left from the teardrop build. I fired up the band saw and cut off the wooden dowel handles. (Seriously--that's what I did!) I'm reasonably sure we don't need the varnished-soaked sponge parts so those we parted with. So we're down to a single box of dowels.
Another good idea would be to try and make some things out of the scrap. We just bought a 3D resin printer, and we need to keep the room we use it in at around 70 degrees. Much easier to do if we wall off the end of the room with the utility sink. We already have a door from another project. We don't have drywall, but we do have a lot of 1/4" AC plywood that will work fine down there. But we will need studs. Most of my cut-offs are, well, cut-offs; too short for a wall frame. Of course, while buying studs, we should also get a few extra for future projects.... It never gets better, mess-wise!
In my deepest heart-of-hearts, I know how this is eventually going to go: Having no better ideas, I'll haul most of the stuff down to the garage "temporarily." Then, once we have the workshop looking nice (enough), I'll begin to back fill. Of course, the day we get the shop, garage, cabin, and surrounding woods all neat and ship-shape simultaneously will be the day after the apocalypse, or something like that.
Not to sound negative; I'm looking forward to the project!

Tom