I keep detailed track of everything that I do....what was done...how long it took....photography...edititng...production...ever ything.
Then I calculate any exspense...add that and x15.00 hourly rate.
It's funny when you tell people that it might get spendy and that they would really benifit from a good long sit down to talk about what end result they want. I find beer loosens them up..but it can make them crazy too!
Most people I've delt with think that I have a magic wand and I just use fairy dust to get the rest done. Do they not understand...it a long hard day on your butt in front a screen?
I'm not an attorney, but based solely on what you've written, he most definitely does not own the rights just because he's used your work and not paid you. I mean, that's one of the stupidest arguments...