
If you are interested in a DIY T12 controller board, you should take a look at this article.
First, you need to fabricate the controller board, the aluminum substrate, and the front panel.

Then, you need to cut the front panel apart with scissors.

Next, you can solder the components and assemble everything together. You can also compare the sizes of the two versions.
You can compare them from the side.

You can compare them on a desktop.

You can power the controller board with a 12V battery.

You can use a 0.96-inch display.

You can also use a waterproof battery case with a 6-cell 18650 battery pack configured as 3 series and 2 parallel (3S2P).

Alternatively, you can power it with a common router power adapter that you already have around you.