Here is the template Ferret is talking about, scroll down for different ratios.
Everything should be on the OtterCustoms site but just in case...
The eye holes you drill for 1/8 bit. I didn't use the template but took a measurement from the detent side of the marker and compared it to where a ball sits in the breach.
My eye holes are slightly behind and toward the bottom of the ball. So the ball has to come all the way into the breach to break the beam. The eyes actually sit just out of the chamber, while the feedneck side is slightly exposed on the top it doesn't intrude into the chamber. No worry about the bolt smashing them.
You will need a clamping feedneck, I used a 3skull one on amazon. Then you will need to dremel out the clamping feedneck for the wire and eye as this side is held in place by the clamping feedneck. It should hold everything in place without placing pressure on it, it just needs to sit all together. The wires are stiff so will not move if you don't give them space to move.
When I drilled I went VERY VERY SLOWLY, using a carbide bit, and drilled straight through the hole body, one pass all the way through. This way my holes, even if not perfect, were straight to each other.
I used a a level bubble gauge to assist in keeping everything level. Have your drill on a slow and low speed. You want it smooth, or else you can misalignment the hole or make awful burs. I only needed a few swipes of my fine file to clean the edges of the eye holes.
With all that said... Ferret is correct that with a force feed hopper and working detent the MR2 doesn't need eyes, and you should have these things already to take advantage of what the MR2 can do, which is shoot fast.
Here is a good reference where I drilled. Sorry it came out a bit blurry. taken with my potato.