CV numeric keypad

Modified from: 3-Key CV Keyboard_Three-Key Engineer Keyboard_CH552G - LCSC Open Source Hardware Platform (oshwhub.com)
. Thanks to the original author.
Modified the Type-C package, modified the programming button, modified the wiring, added LEDs, added keyboard panel backlighting, and adjusted the size of the screws in the same group.
Ignore V2.0, only look at V3.0 and the positioning board. The base plate can be replaced with a V3.0 board for aesthetics.
When soldering the Type-C, be sure to fix it on both sides. If you only solder the four positioning pillars from the back, it is easy to pull them out completely. Always fix it on both sides. The temperature should not be too high, otherwise it will burn the plastic and make soldering more difficult. Other aspects will improve with practice. The original author has already provided a good description, so I won't go into detail here.
The keyboard backlighting uses a copper-pile barrier layer and a solder mask layer, which has an ideal effect and can be clearly seen in the PCB file. The boxes and crosses in the document layer are used to find the center of the circle.
From top to bottom, there are screws, double-through copper pillars, and single-through copper pillar screws. The top plate (positioning plate) is 1 mm thick, and the other plates are 1.6 mm thick. This design securely holds the mechanical key switch in place, preventing it from moving forward, backward, left, or right, while still allowing for easy insertion and removal. This fixation is already very stable. If you want the mechanical key to be firmly secured to the panel, the original design allows for a 1.6 mm thickness, meaning you need to use a 1.6 mm top plate. Additionally, the length of the copper pillars needs to be adjusted to ensure that the distance from the top surface of the central layer to the top surface of the top plate is 5 mm. WCHISPTool_Setup.exe - Nanjing Qinheng Microelectronics Co., Ltd.
BOM
CH552G 
TYPE C Female Socket JLCPCB C2765186
3 x 100nF 0603 Capacitors OR 2 x 100nF 0603 Capacitors and 1 x 10uf 0603 Capacitor
1 x 10k or higher Resistor (optional, as shorting is not required with my method)
3 x Kailh Hot-swappable Switch Sockets
3 x Switches (any 5-pin or 3-pin compatible
) 3 x Keycaps (any keycaps)
2 x 5.1k 0603 Resistors
2 x 1k 0603 Resistors
2 x 0603 LED
Screws are M2, see reference image