FTDI stdk 500k not responding
Right now I have it on Arduino Nano/Atmega328 + AVRISP mkII


Tha AVRISP is not an FTDI programmer. How do you have it wired up?

See: How to make an Arduino-compatible minimal board

From that page, this is how I hooked up my FTDI cable:



And a close-up:



You need RTS, via a 0.1 µF capacitor (in series) in order to trigger a reset.