I don't want to throw gas on your fire, but the last time I did a job like you want with someone that said " that's close enough" I ended up putting in over 35 hours on a job that should have been done in 4. It only ended after I had enough of his " close enough revisions", and told him to find someone else. Of course I didn't get paid if you're wondering. From that point on if there's no print or dimensioned sketch, there's not going to be any work done.
Thanks for taking the time to reply. I have never asked anyone to make this, so telling me what you wouldn't do doesn't really help me figure out what I need to do. Thanks!