So I lucked into a Sky x-over/hi-steer setup (If I'd had to buy it, I'd have gone to ORD, but then I'd have left the tierod in the stock location anyways). Pitman arm is from ORD. There's not much room to move the axle forward without encountering interference with draglink/pitman arm on driver's side compression; 1 inch is probably possible. Not sure whether I'll try or not. My truck has just 3" lift, so the low amount of lift may contribute to the interference since the low lift spring doesn't move the axle back very much upon compression.
On another note, the Sky draglink hit the factory x-member while flexing the truck on the shakedown run (again, maybe the low lift height is partly to blame), so now the ORD crossmember is in for clearance. Maybe if the bend in the draglink were somewhat further over to the driver's side, contact to the factory crossmember could have been avoided.
Regarding flexing the springs into the steering linkage: the Sky arms are tall, and there's plenty of room above the springs. On my truck, the springs would have to go to a significant negative arch to make contact. At that point, I figure I'd have a lot of other problems anyways.
To prevent excessive uptravel (just to clarify: because of tire clearance and shock travel, not because of problems with the steering linkage), and to keep some room in the fenders, we just built a spacer for the bumpstop. Field testing in southern Utah is planned in 2 weeks.