I know alot about steel and I know that that clamp was not designed to do what you are trying to do with it. That clamp will rust apart in 6 months. Its not even galvanized, much less hardened stainless steel. Even if it was, its still not designed to support lateral loads. You dont even have the plastic spring rest installed so your spring is not sitting even on the strut. What you are doing (and you can believe what you want and drive it all day) is dangerous and I hope it doesnt have a deadly result for you or anyone who is riding with you or driving around you.
I suggest that no one attemp this mod!! Buy the correct parts and dont try and be cheap about the suspension components.
Btw, the clamps are SS. And agian, they are NOT holding the load. To add, the springs are not being supported by "cheap" plastic carriers. They are metal. If you look closely at the photo, you will clearly see them. Again, this is not my first rodeo, folks. I'd track you on the twists any day. Like this guy said, don't try this at home. It is very clear that most of you on this post are NOT experienced in custom fabrication. Just because they sell it to you for a ridiculous price. . . anyways, cheers )