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Hi. It is still a very bad idea.
If you want to play with PCB design just replicate the openbook device/firmware. It should be way easier and more fun.
If you want to play with KOReader just get a device where it works for the most part and fix the platform bugs that still remain (ie: pocketbook).
If you want to play with a RPI and a shitty Eink display just get them and play with easy stuff: learn to draw text and images to screen, the different refresh modes. Figure out a proper way to use the thing without KOReader as the main purpose.
Then, once you master your "device" you can write a proper port to KOReader.
It will suck because KO is meant to be used with a touchscreen or a pointer device.
It will suck because KO wasn't never actively tested with resolutions below 800x600
It will suck for many, many reasons.
And, on top of that, you won't get any kind of support during the port. Even if/when the port is done it is unlikely to be maintained upstream because there's no device to maintain.
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