Looks interesting, especially the frankenstein model in the ThinkPad T41 chassis as that has a lovely keyboard and display aspect ratio.

However I think the biggest problem to tackle here is not the hardware but the software. If it runs for example some kind of regular Linux distribution or Android it won't be very usable as they're just not designed for e-ink. If on the other hand it runs something custom, it would need to be able to sync documents to the exact syncing setup that I currently use for me to consider buying it (and of course also the exact syncing setup of any other potential buyer, of which there are probably close to infinite, especially in the kind of circles that this device appeals to in the first place).