Using USB-C Super Speed Alternate signals

Hi

I am playing with USB-C

USB-C has 4 differential pairs, so called super speed channels, that is ena bled in USB Alternate Mode

I am considering using them for my own signals between own design equipment , but of course still complying with the direction of the signals (so in my system I will always use an USB defined RX pin feeding a TX signal onto th at line. I will keep signals on max 3.3V levels to comply with the standard

That way, if I ever connect the USB-C cable to a PC, I wont destroy anythin g

Also, I will add a protection device to handle the 20V that a USB-C port ca n deliver, if it is negotiated to do so (it might be that a port by mistake is negotiated to do that, and I don't want that to create problems also). So you guess correctly, I am also using VBUS to power the device

Do you see any problems doing that?

Thanks

Nick