Most municipalities consult outside engineering firms to design their organics facilities. These businesses can be hired to look at systems, or can be hired to design a chosen system on a site you have already. They will look at your footprint, equipment needed and processing rates to produce end product at a rate your site can handle. Take a look at these RFPs as you are developing your own. (This is not an endorsement of the RFPs listed, but serves as an example for drawing up your own procurement documents).