Gibson Epiphone Chibson twin neck Jimmy Page. You may want a third selector switch or coil splits / phase on the 12-string. So drill holes in the 3d printed version.
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The third selector switch will require routing if it is a full size switch like on the Epiphone. But the rout up the middle is doing nothing on the Gibson,
A push/pull switch to disconnect the 12-string is probably a reasonable compromise. Check if you have metric or imperial holes in the wood.
