The flat design would seem to make this even less ergonomic than a laptop (an already low bar). Is this meant to be placed on a desk? The user would basically have to hang their head down to look at the display, which is just in front of their fingers. There is no possible way to maintain a healthy posture without an external display.
Otherwise, the retro hardware aesthetic is cool. Reminds me a bit of the early briefcase-format portable computers. I can't think of any actual use I would have for a thermal printer, but I like the idea of it.