well i am familiar with setting these up as most all of my grows utilize light movers...
anyhow, there is a couple of ways you can do this. I will explain the easier way, and then the harder way.
Easy way: Securely attach light RAIL to ceiling... attach mover motor, and then hang a parabolic reflector with bulb housing...
The problem with the easy way is that it requires perfect temperature control, you will need an AC that will be able to keep the heat down to a tolerable level. It's easier than the second method because it requires no ducting...
Method #2 (the pain in the ass)
Secure your light rail to the ceiling, attach mover motor, and your air cooled reflector with bulb... then attach your ducting to the ceiling using bungees... Make sure you have enough room to let the light move from end to end on the rail... I have set up multiple systems on light movers with ducting, and while it is difficult to do, and can require a little bit of attention, you can keep the temps down and the bulbs closer to the canopy...
how you arrange your rails in the op is really up to you... but it is best to keep all of your rails running the same direction... or do 4 rails running one way, and 2 rails running the other way...
make sure whatever you mount these puppies to is sturdy, I've had reflectors fall on me, and that shit really isn't fun... especially when they have power.
this website has light rails: http://www.bghydro.com/BGH/items.asp?Cc=LM&iTpStatus=0&Tp=&Bc=
and if you become an elite member, I have a coupon code posted in the forums for 10% off your total purchase, which could save you some $$$ if you're buying 6 light movers. ![Smile :) :)](/styles/smilies/icon_smile.gif)
anyways, that's all I really care to offer... good luck bud - hope it all works out for you.