There is no real answer to this question, as Norbie said, if you give the job to a custom manufacturer or do most of it yourself.
You can consider using an air-con compressor mounting bracket as a starting point to attach the S/C then you have to organize a belt, custom inlet and outlet piping, modified inlet manifold, new fuel mapping and or additional injectors to handle the air flow increase, electronic control for the S/C, the list goes on. No such thing as a free lunch.
Mitch.
PS: Do you plan to make it all legal and insurable ? I don't want you hitting me or anyone I know in an illegal car your insurance company won't touch !