Handy Console frame for WaveShare GamePi20

This THING was prototyped to use WaveShre GAMEPI20 as a handy console.
Requires GamePi20 and Bluetooth mini keyboard.
If you have a cylindrical mobile battery(Dia.=23 or 22mm), please add it, as it is useful for increasing the operating time.
(GamePi20 has a built-in lithium battery, so an additional battery is not absolutely necessary.)
If you don't need a cylindrical mobile battery, substitute a cylindrical part output by your 3D printer.

There are many types of BlueTooth mini keyboards.
I tried the following RiiTek products.
You will find many similar shapes and sizes.

Please refer to the photos for how to assemble.

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requirement

WaveShare GamePi20
https://www.waveshare.com/gamepi20.htm

-BlueTooth mini keyboard

Riitek mini Bluetooth Keyboard Rii Slim RT-MW518,
Riitek Rii mini Bluetooth keybord RT-MWK02, Ewin Mini Bluetooth keyboard+touchPad
or similar.

-M2.6, 10mm Bolt&Nut
4 pairs.

-cylindrical shaped mobile battery[Dia.=23mm or Dia=22m