Guys, I'm not trying to get into a discussion about insurance and such, just whether or not I should be ok in leaving the oven on while I'm not home.
I think I'm going to cook it prior to his arrival, and will leave it in the oven, with the oven off. I'll plan it so that I can turn the oven off shortly before leaving, figuring that in the worst case scenario, we'll have to reheat it when we return. Best case scenario, it's still warm.
I guess the other option would be to do the prep work that evening, and toss it in the fridge for the night, and then bake it the next day. I may give that some serious consideration as well.