I finished the spindle mount this weekend, it's a simple affair to get started. I'm going to be making my first cuts with the machine this morning, assuming my initial "cuts" on air go well.
I'm using an inexpensive Harbor Freight router as a spindle. I mounted it on the Z-axis with a piece of plywood for a baseplate and a pair of muffler clamps to hold the router body. I've placed some strips of inner tube rubber around the router's body to help the grip the clamps have on the router without having to gronk down on the U-bolts too hard.
Now to actually try cutting some material...
-Mark