Some of the things that you list are deductible, and some are not.
You can deduct the out of pocket expenses for shipping materials, and the fork lift rental and the mileage ( at 14 cents/mile) incurred on behalf of the charity.
You can't deduct the value of your storage space or the value of the housing provided to the missionaries, and you can't deduct the meals you provide to the missionaries because you can't deduct expenses for feeding individuals. It's possible that you could claim that the meal expense is through an arrangement with the 501(c)(3) charity that the missionaries "own" (similar to hosting a foreign exchange student) but the IRS would likely scrutinize this arrangement, so be sure to maintain records of the expense, and a written agreement with the charity.
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