Rfid-> Arduino -> rPi -> projector

I have a project that I'm working on and would love any help, pointers, advice, etc. I have some experience with Arduino, but not much with rPi beyond flashing an SD with PiMAME for kicks.

Basically, I want to have video playback triggered on the rpi when a correct RFID is read. There are multiple objects in the instilation but only one will trigger the playback. I figured the arduino would be better at interfacing with the RFID readers (these ones https://www.sparkfun.com/products/8628 ). I got these logic level converters as well: http://www.adafruit.com/products/395 I want there to be some video playing all the time, and have the 'active' video play when the right conditions are met (rfid reads correct tag). I'd also like to have the video turn off if the object is removed prior to the video finishing

What are the first steps towards this? Am I crazy?

Step 1.

Turn a Raspberry Pi Into an XBMC Media Center, Pi into XBMC in 35 mins .

XBMC is capable of being controlled by a number of devices including: Keyboard Mouse Remote control CEC

http://wiki.xbmc.org/index.php?title=Remote_controls

Test USB keyboard to start or stop video play.

Step 2.

Arduino Leonardo Keyboard Emulation, or whatever Arduino which support USB Keyboard Emulation.

http://blogspot.tenettech.com/?p=2599

Step 3.

Arduino RFID reader

Step 4.

2+3, and connect Arduino with Pi.