Looks cool. This is very similar to what I was planning to make except I am going to use toggle clamps. What software you using? Kompass? Solidworks? Are you planning to share the model?
I would suggest to use spacers on 2 screws guiding the clamps on the plate: this way you can make thru holes in the clamps, as to make blind holes the way you draw would be extreme difficult even for Soviet Machinist 8-), telling you as a mechanical designer and technologist.
Interesting. So, you have decided to change the part holding the tension bolt. It was a very original solution (self-locking bracket).
The previous version IMHO was much more technological in manufacturing process…