I created a panel for you already, which I printed out in nylon with 3 walls and 20% hex infill.

To fit my printer I had to cut it into 4 quadrants, then I weld it together using a soldering iron above the glass transition temp of the nylon, but not hot enough to burn. Finding the right temp is a bit trial and error. I used some additional nylon to fill in the valleys made by my "welds".

I pushed almost all the way through the joints from the back and used a lighter hand on the front to make it look nicer.

The screen can be mounted with automotive detailing adhesive (the kind used to keep exterior ornamental components attached). The panel is designed to be open around any rear mounted components so the screen should be able to mount flat.

Now is the time to install a PC power button. I found some cheap buttons on Amazon and soldered it to some header I had laying around. Likely there is a real power button you can buy somewhere that would serve better

There are fan holes and screw holes for the fans. My fans wanted M3 screws, but the holes are big enough to fit M4 screws.

The PowMr screen can fit in the next slot. I "installed" it with hot glue since it lacks a good way to really mount it.

And finally your battery on-off switch fits in the last open spot.

Hook the screen up to the PC, HDMI and both USBs.

There is extra space on the panel for cable passthrough.

A USB cable for the keyboard can fit through the passthrough as well.

Since you are installing a keyboard cable, go ahead and use velcro strips to attach the lenovo combo-keyboard to the lid. I suspect most use will actually involve the keyboard being removed, but in a pinch it still works fine.

It's really that simple.

You just need a bunch of parts, tools, time, and specialized knowledge!