It looks like there's a metal(?) frame with rivets, screws used to secure internal electronic components, and the internal wood 'body' seems to be assembled with fastener-less joinery. There are some photos of the cubesat without the frame here: https://www.infoespacial.com/texto-diario/mostrar/4304727/ja...
Site with some photos:
https://www.nanosats.eu/sat/lignosat
I kinda want a Norm Abram PBS special on wood satellite crafting techniques
Indeed it's a woodworking technique called Sashimono which doesn't use any glue or screws, just precise cuts to join wood together.
The Japanese and amazing joinery, name a better combo. So delightful.
I don't speak Japanese, but I can read "10cm" on the video overlay which seems to be about right.
10cm cube has a volume of 1 liter (10^3 ml). That's very wee.
That's the standard for a "cubesat". I believe the industry has standardised on 10cm^3 units for these satellites so that "ridesharing" or multi-party launches can work with less back and forth on systems integration between the satellite being launched and the launch vehicle.
Apropos, youtube gave me a Harbor Freight ad before watching this video :D
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I found a (Japanese-language-only) news piece that shows some of the crafting and assembly of the satellite, and the box body certainly holds together by itself, via some beautifully intricate joinery:
https://www.youtube.com/watch?v=A_F-NzzC7RA