Dodged a bullet there
I once had a polite request to build a "device"! for the local Airsoft folks.
Needless to say it never got built though have the "ice cube" VFD tubes and suchlike here.
The annoying thing is it would have been a paid job, only ever used for the game and not threatening in the slightest although might have freaked out Mr Random Passer-by as it had quite a lot of wiring, blinkenlights and "Undo the red wire from terminal A, etc" ie full blown defusing required not merely typing in a code on a pad.