My motor controllers are in a different box. The shell is JUST the control head unit. containing a 7" lcd (shell capable of upto a 10") a TINY tinkerboard that takes up 1/4 of the mountable real estate on the back of the LCD. and almost nothing inside the shell, The photos may make it look a little crowded but there are some parts that I have removed and not updated the photos yet. So if there is an RPI style MESA driver HAT it would have plenty of room. or any of the smaller mesa boards would fit in the shell easy. In my photos there is a picture showing a protoneer RPI-CNC hat. that fit easily. but that HAT does not work with linux cnc being GRBL based. Which I think is stupid not to support. Sure its limited in complexity of math. But there are plenty of cnc machines running on grbl just fine.
I dont know what the board size of a 7i75e is there are no references to the boards dimentions in the manual, and after doing a quick google wouldn't touch it with a 10' poll with a price tag of $200USD. I'm not interested in exploring external motion control boards for my self until the tinkerboard proves its self unworthy to do such tasks. The cnc machine I'm building is a 30x30x12" moving gantry mill. I'm not investing in driving a $10k machine. If I was I'd be very interested in ensuring I have the top of the line control system.
