Before discussing price, one would need to discuss, what - exactly - a bicycle build will entail. The job as done by various people, and on various bicycles varies tremendously, but probably less than what people expect.
So the process begins with a discussion of what will and won't be involved, and ends with a discussion of who'll take responsibility for the surprises, like problem parts or failures in use (and for how long).
Only after the details are fleshed out is it reasonable to talk price.
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