I went back and watched all of Del's videos. His design, as I previously stated, is very clever His aiming system should be extremely accurate. What jumps out at me is the fact he demos it on a tabletop rather than on the ground where it is designed to be used. In the top video he uses an extension making it more top heavy. Tripods are at a "working" height for a reason. The Azimuth adjustment is obviously hard for him to turn. He even suggests using a socket wrench for fine tuning. As he does adjustments, it is apparent it is wobbly even with 20lbs of dumbbells in use. There are also lots of pieces begging to get lost. His replacement of the Tilt and Elevation nuts with wing-nuts is a great idea. I did that with even bigger "T Knobs" when I setup my TV4RV.com rig.
I also looked up the Sled. Looks very difficult to plumb and requires eight concrete blocks to weight it down. Would work great for a seasonal site.