The ranco controllers can be bough either prewired or you can wire them yourself. I did it myself because its cheaper but its your choice. Look in my signature and you can see my own keezer project if your curious. I would assume besides the hardware for actual kegging (co2 tank, regulator,taps,hosing,kegs, gas and liquid quick disconnects, possibly an air distributor), you may want to build a collar to allow for excess height although you can get by without it. The purpose is to allow more headroom for the cornies as well as possibly allowing the co2 tank (mines 15 lb and tall) to fit inside as well as allowing cornie kegs to fit on the compressor hump inside most freezers. Look in the DIY section on here to see other conversions.