If the end user is going to connect the neck to the base, I would install threaded inserts in the end grain at the bottom of the neck, lined up to holes in the base that have a stepped hole made by a Forstner bit for insetting the heads of knock down furniture bolts. I would include those bolts and a matching Allen wrench in the hardware packet. You can go simpler by including wood screws, countersinking the bottom of the base, and drilling matching pilot holes in the end grain at the bottom of the neck, but people can more easily mess that up. Just my opinion. You have several OK options.