I will join if you decide to run a GB!
Your knowledge of KiCAD is by far greater than mine. I have been wanting to take the time to learn, but have been putting it off. Sorry, I wish I could help!
It looks like you have made quite a lot of progress. How did you for example tell KiCAD to place all the switch footprints exactly how they would need to be placed for your layout? Is there a plugin to import KLE files?
FYI, the reason I was interested in null's project is the PCB controller for the Filco I bought for my girlfriend's Galaxy Class keyboard got damaged. She's left handed, so might even be happier with this design you have going on here. Your design would however require a custom case, so perhaps some DXF files to laser cut a sandwich style case are in order? I'll try designing some using the KiCAD files.
I can also see the ergonomic benefit if like most users you use your right hand for mouse control, since the shorter distance between the home row and the mouse means faster transitioning. Also since most people are right handed, a lot of folks over-use their right hands anyway, so giving the left hand more stuff to do could also lead to a healthier balance. Personally I just switched to using my left hand for mouse control, which helped me with all of the above problems, but really has held me back from any PC gaming.
Anyway, I can at least confirm for you that when I open your project in my KiCAD installation, it opens successfully. That's about all I know how to do at the moment.
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