Seems like a long time since I have built one of these. What is cool is that I found some Easton Elite NOS tubing that would not be suitable for road of CX but was perfect for this frame. It isn't very light at 4 lb. 7 oz. but it will take 2.5 " tires and be really bomb-proof.
The head tube will accommodate a tapered steerer-pretty much all you can get in a shock fork any more. The slider inserts will be for a 142x12 thru-axle. These inserts were just there for the fixturing process.
This was a really fun build and the frame will take any abuse the rider throws at it.