I had a nice chat with skaman via PM and decided to go for ordering his PCB as well as the Tototek HuCard slot - trying to mate them at my own risk.


Skaman's PCB as it arrived.
The Tototek Hucard slot.

Top

Underside. The mounting pins are in a different alignment than the original HuCard slot. No suprise here, since the Tototek slot is meant for use with their own dumper PCB.

Side view at the mounting pins. These do not carry any electrical connection to the HuCard interface pins.

I had to drill skaman's PCB to clear the Tototek slot mounting pins. Then I scraped the solder mask from the surface surrounding the pin holes to uncover the copper underneath. I mounted the slot onto the PCB and distributed a generous amount of solder to the mounting pins. Since the copper forms a large heat sink connected to the ground pin, having a soldering station with high thermal capacity and an extra wide tip in the handpiece helps a lot. I went for a Weller WS-81 with a WSP 80 handpiece.

Then I soldered the rest of the interface pins and tested them against the PCB's pins usind a DMM. Some pins are assigned in a different way than found in AaronE's wiring schematic:
https://www.retrode.org/plug-in-adapters/ 
Blazing Lazers HuCard test-fit


And there you have it, the HuCard plugin adaptor for the Retrode. Merrily dumping your HuCard ROMs to any device you'd like to by USB mass storage protocol. Make sure to put the whole adapter thing with the HuCard slot facing to the Retrode's backside in the SNES slot, and set the voltage switch to 5 V. Also, upgrade the Retrode's firmware to at least v0.26a - I didn't do it yet, d'oh! Too bad FLIP refuses to do the upgrade on Windows 10, so I need to make up for it tomorrow at a Windows 7 machine at work.
Modifying a stock SNES cart shell to hold the plugin adaptor is on my to do list as well.