Its been done, but AFAIK not with hand etching: http://hforsten.com/making-embedded-linux-computer.html http://hforsten.com/making-embedded-linux-computer.html

Its been done, but AFAIK not with hand etching: http://hforsten.com/making-embedded-linux-computer.html http://hforsten.com/making-embedded-linux-computer.html I don't think you can do high frequency RAM lines with hand etched boards or BGA escape routing without vias, but two layer prototype boards are pretty cheap these days.