The socket systems seems like a nice product for the DIY'er, just a couple of comments,
1. Check with your local building inspector if this system is approved.
2. Check with the manufacturer (socket systems) and your state if the engineer signing the drawings if he is registered with your state. You can usually check your state board of registration for his name and registration number.
3. It appears to me that the engineer if just signing off on the socket system components and not the overall building, so they would only be liable for their products it there was a failure. Companies have a way of placing the blame on the installer and in this case that would be you.
4. Make certain that the concrete slab can withstand the "uplifting" of the wind force and "live loads" such as snow in your area.
5. I would suggest talking to an Architect or Structural Engineer in your area to review your building plans, sometimes an 1/2 or 1 hour meeting at a cost of $ 50 - $ 120 with them might alleviate any future problems.
Good luck with your project(s).
