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This is a nice project, but you can easily spend over $500 for molds and equipment. That makes it way too expensive if you're only going to use them once.
Do you think this would work with salmon, dashi, and kanten?
Do you mean Sugru?
I've done this with cedar, cypress and pine, but I use a torch and don't burn it quite as much as you seem to. I've cleaned it up with brushes (both metal and nylon), sandpaper, and steel wool. I like steel wool the best. I like to reveal the grain a little for contrast. I have finished it with tung oil and polyurethane. Both have worked well for me.
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This is a really interesting project. I know a little about this stuff. I have a professional EEG amp and 6 caps and have been doing this stuff for years, so I can easily try this, but this is a DIY site! I think it would serve the community more to focus on more affordable options.
The way I learned this is to fold up a little fin with the loose edge in order induce spin. Also, you can make these in a left hand or right hand configuration by changing which side you tuck on the inside (although a right-hander can throw the left hand version underhand and vice-versa).
I really like the case you used! I made something similar, but made a wood case and used a 8 x AA, 12V battery pack I found on Amazon for about $4. I filled with Eneloops, so I prefer to use the Panasonic charger.
You should try clear resin with a glow-in-the-dark powdered pigment. It's fairly inexpensive on Amazon.
I have gotten some bad connections from the solderless connectors I've tried. I think it's better just to solder them and be done with it.