I haven't received the Rava yet, but here's how I've arranged the wiring, after browsing some of the DIY cable sites:

1) I am using Belden 89259 coax for both in the in-wall and patch portions of the interconnect. This is the wire used in the much-vaunted Jon Risch DIY interconnect and in DIYCable's subwoofer interconnect kit.

2) The in-wall portion will terminate at either end at an inexpensive solder-type RCA jack from Parts Express, mounted in a standard wall plate.

3) I will use the remaining cable to make two patch cords, each terminating in Dayton Audio locking RCA plugs, also from Parts Express.

The cost for the cable and all parts (including wallplates, solder, and soldering iron) was less than $100. Now let's just hope some of my soldering skills have survived from my teenage days....