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 the Raspberry Pi is super easy
- Minimum screws.

### Tips

- The powerbank circuit looks powerful, but the lcd draws a lot of currency, so the Pi always show the "lack of power" mark on the screen.
- The usb ports on Pi are replaced with two AF90 usb female ports. The two free ones are connected to the keyboard dongle and the usb hub circuit.
- I print the coverD with transparent PLA, looks great.
- The powerbank circuit uses a lockless button **(click to power on, push down for 4 secs to