Very cleanly done! If anyone wants the notes i made for hackypuff's keyboard i likely still have those around. Isn't the 703 a nice casing to work with?! The latching clear lid leaves innards protected but accessible.

Cool project. Did you plug the display with the HDMI port?

Sure did HDMI micro to mini, simple is best. I also wanted to be able to connect it to a TV whenever without disconnecting it from the display.  

Thats also why I prefer the Pi4, it has 2 HDMI ports.

Is there any way to wire this screen using SPI or DPI?

nice project. verry nice

is possible control backlight keys? for example w3m have workplace and i need backlighting 0-9 key similar akctive workplace.

is possible using lov profile mechanic keys? and adding power battery? for a week working time on one charging (or two)?

I haven't tested everything with the keyboard but as for back light control, you can change the colors or color range and the array at which it flashes. Thats pretty standard. I can't say for sure about lighting a specific set of keys differently though. Most gaming keyboards have lighting control software. Sorry for not knowing all its capabilities.

I'm running my display, pi, and keyboard off the battery pack. Thats why I went speciffically with one that I could connect an extension cable to keep it powered from a socket when using it for a long duration. 

Without it I would only get around 6-8 hours of useful run time. I have enough room to put a larger battery but I could only see getting 1 or 2 days out of it and I also wanted to keep it easy to access when the power got low. 

The pi4 works best with a pack that uses USB C and quick charging to get as close to a consistent 5.1V as possible.

For me, 6-8 hours is way too short. I write programs much longer. It needs a week, but it doesn't need wifi or a fast processor