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I consider my blogging hobby always under construction because there is a never ending amount of new things I want to try whether it be a plugin, online monetization service, contest or other series of posts. It is something that one can never be complacent at, you have to evolve as quickly as the landscape around you and see trends as they hit so that you can ride the wave or risk being relegated to obscurity.
Though I think your blog and website itself should always appear complete, trim and neat to readers many of us have things behind the scenes that are under construction that our readers don’t even know about half the time.
So I found out a while ago that there is no "finished" in blogging as long as you maintain a blog and continue to create content for it, when blogging your site and business is always under construction.