Love the idea but I think you need to solve the problem of shipping before you invest anything. I used to run a business doing more than a million £ in sales but net profits were low due to high shipping costs. I ended up eventually closing that business so that I can focus on the other fast growing business with better margins. I simply could not beat the likes of Amazon. Either don't ship or ship local or build a food trading marketplace to connect growers/buyers. Talk to local shipping discounters to see if you can get bulk discounts to make it profitable at the end. Hope it helps.