Tell you what, I’ll let you find the best next gen slate for us, buy one myself and design a version of the case for that. It only takes me a few hours to modify the design to fit anything. It sounds like you have about the same needs as mine when it comes to a slate. Make sure I know what the best slate is and Ill make sure you get the best case… 
Thanks,
Isaiah Coberly
NewPencil inc.