Last 10% takes 50% of the time

For most working people, with families, if you buy a complete project, or one in a million boxes, YOU better be able to do the work and spend years on it. If you are retired. have a schedule to get it done before you croak!
People don't buy done cars because: they cost too much, or the work does not suit them, or, they can convince themselves the work done suits them.
There are reasons well done cars cost what they do now days.