MXM to PCIe connector - help in understanding some of the MXM pins
I found the following myself, leaving as a note for anyone researching this -
1) PWR_GOOD to connect to 3.3V source through a 10K_04 resistor.
2) PEX_STD_SW to connect to ground.
3) PEX_RST on MXM to connect to PERST on PCIe.
4) Connecting the PCIe 3.3V connections to the MXM 3V3 connections is fine. Mind the polarity.  

My project has stalled since events in my life have gained priority. I've also had to sell my laptop, reducing the incentive for this. I may however still pick this up once I get a new laptop as I intend to get one where I can upgrade most components.

In case you progress on this, please drop a note here. It would be great to know how it worked out.