I thought I would post this, in case it's useful to someone else. I was quite proud of myself for thinking it up
I've wanted a photo tent forever and I'd seen some tuts online with cardboard boxes, but they looked a bit flimsy to me. Then it hit me! I had these 10x8 wood picture frames from the Dollar Store lying around (I use the glass for polymer clay work). So I took some leftover nails I had from hanging pictures and used 3 on each side of a frame to create a channel to slot the other frames in.
That's just to keep stuff in place while I use my trusty glue gun to "grout" everything (because let's face it, Dollar Store frames are not the straightest ever!).
Now the wood box is really sturdy! All I did then was tape some remnant cotton white fabric (I wanted to be able to remove it to wash it/ change it) and voila! A cheap photo box! The only thing I had to buy was a full spectrum light bulb (I read that's best). I plan to experiment with covers and light-sources next.
The advantages are that 1/ the bow is sturdy so I can really stretch the fabric over it and 2/ the normal "grooves" of the frame make a perfect channel for the cardboard background.
Obligatory test shot: