qmk_firmware/keyboards/checkerboards/ud40_ortho_alt/keymaps/default
..
config.h
keymap.c
readme.md

The Default UD40 Ortho Alt Layout

1.25 - 1.25 - 1.25 - 2.25 - 2.25 - 1.25 - 1.25 - 1.25

or

1 - 1 - 1 - 3 - 3 - 1 - 1 - 1