I did a project like this awhile back, never really finished it though. I basically took my old Asus EEE 701 soldered a usb touchscreen onto some headers on the motherboard and flipped the top half around so the screen faced out. It actually worked pretty decent. I didn't really take enough time to make the case look professional, but it was aright. The challenge was getting software that played nice with everything. I was using ubuntu, but with work I'm sure someone could run one of those x86 android ports on it.