As a left-hander, gaming is quite unergonomic. The default keybindings in most games are made for the left hand around the WASD keys. For the right hand (as the left is using the mouse), either the keybindings have to be changed for every game or you have to do some finger acrobatics in order to reach some keys.
For right-handers, plenty of gaming pads are available that are basically half a keyboard for the left hand, improving the gaming experience. However, I could not find any such product for the right hand (and as such for left-handed people), so I am building my own.
On the default layer, the left half of a qwerty keyboard shall be (mostly) mirrored, so the right hand can reach the keys on stardard key assignments the same way the left hand could on a normal keyboard. The right half of the keyboard shall be on a second layer.
I did some experiments with painting keycaps. I painted the letters of the printed caps (which are recessed in the keys) with acrylic color (left), then sanded the cap smooth the next day (right). The result is not perfect as there are small imperfections in the print where the paint still sticks, but its good enough for now.