I think what I would do is find a wreck in a junkyard. You will probably need door panels and armrests to accomodate the switches. As you strip that stuff off you can see how it is attatched, therefore how you should re-install on your truck. It can't be very difficult. Running all the wires will be the biggest PIA.
My dually lacks all the power stuff too. The only power accessory I wish it had was power mirrors. I like the manual windows and locks, especially in a std cab.