Hitachi EX120 Aux Hydraulics

I'm looking at a Hitachi EX120-2 machine. It was built without a auxiliary circuit or valve to operate a thumb, etc. Other than buying a valve to add to the valve bank, are there any other issues to deal with? I'm expecting to need a valve, steel piping from the valve, misc. hoses for pilot circuit, pipe &/or hoses out the boom, foot control pedal, plus the labor to install. Any idea the cost I should expect? Thanks

Hitachi EX120 Aux Hydraulics