EPDs are still pretty expensive, but I don't see what's stopping someone from making an open hardware Kobo clone, if they can find somewhere to source 5-7" pane

EPDs are still pretty expensive, but I don't see what's stopping someone from making an open hardware Kobo clone, if they can find somewhere to source 5-7" panels (difficult - I think 4.3" is about as large as easy-to-find solutions go - but probably not impossible) I'm pretty sure my employer would come down on me if I did something like that - ereaders are a pretty small market, even if you don't personally work on anything remotely similar - but how hard could it be? Make a Raspberry Pi hat, stuff a Zero in, and you can probably get renders of pdf/epub/mobi/html/etc pages going fairly easily, to propagate to the display. Well, maybe not a Pi Zero; the new versions come with wifi. But still.