I made this to test out WASD layouts and color schemes. There's a texture for the color of the keys and another one for the layout, so you can swap them out separately.
I used im3rdo's keycap model for R1 to R4: https://www.reddit.com/r/MechanicalKeyboards/comments/1r5384/here_are_the_model_files_for_the_keycaps_i_made/
The non-square keys are just modified versions of that model.
thanks, decided to see what my setup would look like and this is just what i need for my keyboard