Need some input.

I like to see a pay sheet for both good and bad material; it helps me keep track of where I get my good stuff to send you. Trays would be nice to have; but I'd rather buy them up front and have you send me back what I send you with the check (keeps your life simple and mine easier). I wouldn't think a 3 day turn around is a good idea; give yourself time to do it right and those who want sloppy work can go elsewhere, 7 days is reasonable. Pay a bit better for sorted material, saves confusion on both ends. You already do great work, keep it simple!