The 8-inch Raspberry Pi and Raspbian tablet is almost ready for mass production, according to its creators. The CutiePi project has not only finalised the board design, giving it a massive overhaul from initial designs, but also has published design files for the tablet should you wish to build the tablet yourself.
https://www.notebookcheck.net/CutiePi-Raspberry-Pi-tablet-nears-completion-crowdfunding-campaign-incoming.447059.0.html