Not sure what you normally charge for an hourly rate, but some things to keep in mind...
-Travel Expense (fuel, travel time)
-Shoot Time
-Gear rentals. Do you know where the mills are located? Will you need to bring your own lighting?
-Will the 30 meter mill be relocated to its shoot location prior to you arriving onsite, or are you going to sit around while they relocate it? Don't wanna be waiting around for free if they're the ones that are unprepared.
-Most importantly! - Licensing of your images. They're getting hi res files? For their use and ownership? To be distributed worldwide? How many copies of their brochure do they expect to print? Are they using the image online as well? Are you licensing the images to them for 6 months, a year, forever? Do you still own the image copyright so you can use it for your own portfolio? This is where you need to put the most thought into your costs.
Thank you for this a lot of good info and a lot more to think about.
Cheers,
steve
Steve U Wine, Food and Photography Student and Connoisseur