Just one thing I'd worry about is getting anywhere near 60/40 if you're just a second shooter. Her company, she's doing post-production, etc. - I just don't see you getting 40%, but that's just me. With all due respect, I've never seen a second shooter get that much. I've seen 2nd bananas get a $50 bill handed to them at the end of the day, even $100 once.
I suppose it would depend on how "good" you are compared to her, and how much you actually end up doing. Just make sure it's fair for both of you! I would prefer to be a friendly partner with a nice contract put together up front...seems like you'd do a lot better financially. My father is the only one that's ever shot with me at a wedding...just for an example, if I get $1,500 for a wedding, I give him $300. Might not seem fair, but he doesn't have a clue about computers and I'm stuck paying for prints and spending a couple weeks in Photoshop. Seems fair to me. I think I might actually be giving him too much now that I think about it! 
Good luck, Del.
Thanks for all the help!!!

