Awesome job, ale0502!! One way to improve the robustness of the precharge circuit is to pass the precharge wire through one of the 3 current sensors. You could wrap it around a few times to multiply the effect. If the current during precharge shows a surge, and then falls to zero, then it charged the capacitor bank. If the current sensor shows nonzero current continuously, then there's an IGBT that has failed shorted, or some other problem, and you should NOT close the main contactor.
I did the first test of the controller at high voltage. 376.5v peak. It wasn't stressful at all. I knew everything would be fine. haha. This was with the toyota MGR that e*clipse sent to me.