It would probably be easier to build completely from scratch than to try to attach a neck to a box that wasn't designed to support a neck.
Careful though. Building guitars is more addictive than heroin, nobody stops after the first. I've done a couple of cereal box electrics, I'll see if I can find some construction photos.
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Rodger Knox, PE
1917 Martin 0-28
1956 Gibson J-50
et al
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