Just buy a wheel. It will be cheaper than buying the parts and building one,
Only the first time. I can put a new rim on a $800 PowerTap wheel or $400 rear with a record hub for $50-$80.
it will be a better wheel than you will build yourself,
It won't unless you pay a competent builder.
it won't take a year
Wheel building only takes hours, even for the first one.