Thank God for ebay and cheap linear rails. I picked up a mish-mash of parts and put it all together. Everything is MDF though I'd like to replace pieces in aluminum eventually.
All the rails are off ebay, it's amazing what you can find there, not one of the rails sets cost me over $100.00 Motors are part of the Planet USB kit from Probotix, table is a Kreg universal table from Amazon.
Didn't follow any plans just went along from others I've seen and operated. Cutting size is about 24"x17" so not to bad.
I did have the Probotix Dewalt mount, but wouldn't recommend it as it doesn't fit well.
Any how some pics...