Budget solid Raspberry Pi laptop with 7 inch screen

### Update V2 2018/11/10

CoverD and coverC changed , rounded curves, pi mounts removed (for easier installation), added a 8mm switch port, no usb hub, more internal free space, no need to replace pi's usb ports, add extra strengh to screen hinge on coverD.

### Features

- Visible IOs: RJ-45, hdmi, 3.5mm, usb 2.0 * 6
- Display remaining battery power (if the powerbank circuit support that)
- Charge while running (if the powerbank circuit support that)
- Remove and install sd card on th