It's a bolt on conversion, apart from drilling 3 holes to fit the reservoir to the inner wing. When you remove the PAS system, don't disconnect the pipework, keep it sealed as one unit. It's unwieldy, but it can be done easily enough. Fit the box to the baseunit, along with the PAS trackrod, the pump to the engine, the crank pulley to the crank, and the reservoir to the inner wing. Then bleed and you're good to go. The decker panel needs to come off to remove the box, the idler bracket needs to be lifted at that end to get the trackrod out, and with the rad out of the way the front pulley can be removed. There are threaded holes to fit the rear pump bracket, and the front bracket has slightly longer timing cover bolts to hold it. I think that's about it. With a donor car on hand you have a reference for everything.