Great ideas! Tote boxes are one of my favorites things in life. I'll add too, consider using stuff sacks in addition to boxes. In my (now retired) cargo van that I drove for almost 300K miles I used both in under-bed storage and it worked great. My relatives went on a 2-year road trip in their RV that went so well it turned into 6 years. They used tote boxes and a couple of large stuff sacks that I made for them. Theirs and my stuff sacks were different colors for different uses and allow you to, um, stuff flexible items into smaller spaces and/or in or around totes. Some of my uses were separate sacks for tools, jumper cables, misc vehicle parts and laundry. We're still figuring out storage totes & sacks for our 179 so I haven't made any yet.
If you don't sew you can buy stuff sacks. If you think you might sew them, get good nylon packcloth (at least 430 denier), #14 needle, heavy duty thread. Use a longer stitch and stitch more slowly. You can stick a piece of duct tape on them and write the contents with a sharpie if you don't use a color code method that you have memorized. Also, consider keeping the stuff sacks from folding chairs you no longer have - the stuff sacks last longer than most of the chairs that come in them, and are completely reusable. I have my Roll-A-Table in a folding chair stuff sack from the 1990s and it shows no signs of wearing out. And ... in the "two uses & a backup" department, you can use them as throw-bags if you're trying to throw a tarp-line over your Pod for example