Nice work on the schematic, but I have a few ideas about it.
Firstly the RESET button below that drives the optos should be wired NO, so that when it is pushed the drives are reset. I don't know about the leds, but they are already on the board. If you want to see which drive faulted there should be put some sort of logic to do this.
Also the UHU does not have enable pin, rather that it has E-stop IN pin, which will not stop the drive if it is not put to +5V, it has to be driven to logic 0, to do this. There should be a wiring in the BOB so that when one drive faults the other receives its state and stops.
The 4 diodes after T1 should be rotated clockwise by 90 degrees.
With a little of modification I believe that this can be made a good reference schematic for all the new users that use to use the UHU controller.
Regards, Todor