I CNCd my X2 based off of Hoss' plans and have been 100% happy with it so far.
I started out using the X2 manually and I will say that if you plan on doing much manual machining then go ahead and mount up the DRO. I only had my DRO hooked up to the X and Y originally which was plenty. I used a dial indicator for the Z. If you are only going to use the mill manually in order to make the CNC kit then I wouldn't bother with the DRO. I agree with the others on handles too - no need once you get the CNC installed. Also, I went with Roton ballscrews to cut down on cost. I had them load the nuts with oversized balls and it has worked out well. I think I have a couple thousandths of backlash in the X and Y but for what I do, I don't notice it.
As far as electronics, I bought everything from KELINGINC.NET (his kit for the X2 with the 425 oz steppers) and they have worked out great. I mounted it all in a circuit breaker box from Lowe's. It looks kind of like this one but there was no swinging door. I think it was less than $20.
http://www.lowes.com/lowes/lkn?actio...L8S&lpage=none
I mounted the fan that came with the keling kit to blow are out of the box. There is no feed for incoming air - I figured it would get enough from the cracks/slots in the box.
For software I use Mach3 and Dolphin CAD/CAM both of which I also recommend.
HTH
Kevin