Add it to the secondary and then bottle or transfer to keg when you get the taste you want. You could add the coconut in a bag. Boil only the bag to sanitize it, add your coconut put it in the secondary and fish it out when it tastes how you want it.
Some we encountered, are a "solid" surface parking lot, enough bathrooms for customers, customer safety things (disability access,exits and lights), city and state permits for building use (include an architect).
Our 7 bbl system uses Natural gas. I don't think I would go with propane unless I had to. It all depends on the building your in, costs of installing NG line to the building vs. the cost of buying a couple 1000 gallon propane tanks. I know at my home when NG came through they wanted $1800 to run a gas line to my house.