Kossel Corner Reworked V3

I have owned a FLSUN Kossel for a while now, and finally managed to create a workflow that allowed me to use it without spending hours recalibrating it! I've now got about 400 hours on the printer, and noticed that the belts were fraying at the top pulleys, on closer inspection the belts are being pulled across towards the center of the printer and riding over the bearings that act as pulleys. There are two reasons for this, the brackets are being pulled down towards the center of the bed by the tension on the belt (I overtensioned them on the initial build..), but also my FLSUN has the linear rails, which brings the belts more towards the center of the printer than the original carriages. The stock brackets don't have enough adjustment on my printer to cope.

The other aspect I wanted to fix is that to tension the belts requires moving the top frame, I wanted to separate out the tension in the belts from the actual frame dimensions.

So this design is my first attempt res