Got around to weighing both skids. My stock Assault skid came in at 51 lbs. That's with front and back boogies. Toms skid is 37 lbs without boogies. I weighed 2 sets of boogies that I had in bag still from my new sled and they where 3.5 lbs. So real world difference of 10 lbs of unsprung weight. Depending on who you listen to, this can equal anwhere from 1.5 to 2.3 X's the weight savings of sprung weight.
Tom is also looking at stock rail compatability. Looks like it will move the rails back 1" and he is going to verify the scissor alignment this week. Using your existing rails would save you about $350-$400.
Tom also mentioned that he has enough parts right now to build 3 skids and he will sell them cheap this month if anyone is interested. I think he said $1600 but check with him in case I'm wrong.