Before Sending a Board to production I always check my Design in a 3d Viewer.

You may notice this Joystick in the upper left: I noticed it is cheaper to buy these modules on a PCB than building one my one.

Bottom:

What do you see in this pictures:

• I decided to leave some space between the keys. This gives me the most opportunities in choosing different Keycaps
• I added two I²C Connector headers J7 and J5. On this headers you may add some additional sensors like Air Quality SGP30 or Gryo MPU9250
• You may see the Space for the RFM95 Lora Module on the backseide on the lower right side. This was really a pain to layout it in this tight space. But I still decided to add an SMA Connector for an external Antenna.

Before Production:

In earlier Days I always printed out parts and doublechecked of everything fits perfectly with the parts. From time to time I still do this.