In reply to:

Now what is the word for a waster-of-time, one who fiddles around all the day, just having fun?

Student?

Ahem. I spent a good portion of my weekend in studio drafting.

...ah, Doc, your comment cracked me up, and yours, Jazz, just made me hope you haven't lost your sense of humor! I sure do hope you were daydreaming part of that time you were in the studio! And better still if you were fiddlin' around there, too! Oh, I do have lovely dreams of a certain wind tunnel back in the 60s...and great fiddlin' around there....