QRPMe, Rex Harper's site for QRP (reduced-power) amateur radio kits, has a nifty little prototyping board that fits inside of a mint tin and could be used
Adafruit Perma-Proto Mint Tin Size Breadboard PCB ADA723
Arduino + Altoids = Altoiduino - Exhibition - Arduino Forum
11-year old makes Raspberry Pi in a tin gaming machine - Raspberry Pi Pod and micro:bit base
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Sverre LA3ZA, Author at • Page 18 of 18
ElectroniKits - Electronics projects by Lee Hart
Perma-Proto Mint Tin-sized Breadboard PCB
Sverre LA3ZA, Author at • Page 18 of 18
Micro 40 DSB transceiver in a Altoids tin