this is my (and the standard) layout for the atreus keyboard.

The .json can be best viewed and edited at qmk.

More on the keyboard and the firmware.

is close to the standard but probably less emacs driven.

   q     w     e     r     t        ||        y     u     i     o    p
   a     s     d     f     g        ||        h     j     k     l    ;
   z     x     c     v     b        ||        n     m     ,     .    /
  esc   tab  ctrl  shift super bksp || enter space  fn     -     '  alt

fn layer:

   @     7     8     9    *         ||        ^     {     }     [    ]
   &     4     5     6    +         ||       left  down  up   right  ! 
   =     1     2     3    \         ||        $     (     )     ~    \   
   L2    `     0  shift super  bksp || enter space  fn    .    del  insert

L2 layer

 insert home    ↑    end  pgup      ||         ↑     F7    F8    F9   F10
   del   ←      ↓     →   pgdn      ||         ↓     F4    F5    F6   F11
        Vol+              reset     ||               F1    F2    F3   F12
        Vol- ctrl  shift super bksp || enter space   L0             

this layout is almost default (see below), but has the enter alt switch and the following adjustments to the fn layer:

   !    @     up     {    }         ||       pgup    7     8     9    *
   ^  left   down  right  $         ||       pgdn    4     5     6    +
   [    ]      (     )    &         ||         `     1     2     3    \
  L2  insert super  shift del ctrl  || enter space   fn    .     0    =

   q     w     e     r     t        ||        y     u     i     o    p
   a     s     d     f     g        ||        h     j     k     l    ;
   z     x     c     v     b        ||        n     m     ,     .    /
  esc   tab  super  shift bksp ctrl || alt   space  fn    -     '  enter

fn layer:

   !    @     up     {    }         ||       pgup    7     8     9    *
   ^  left   down  right  $         ||       pgdn    4     5     6    +
   [    ]      (     )    &         ||         `     1     2     3    \
  L2  insert ctrl  shift bksp ctrl  || alt   space   fn    .     0    =

L2 layer

 insert home    ↑    end  pgup      ||         ↑     F7    F8    F9   F10
   del   ←      ↓     →   pgdn      ||         ↓     F4    F5    F6   F11
        Vol+              reset     ||               F1    F2    F3   F12
        Vol- ctrl  shift  bksp ctrl || alt   space   L0             

press reset on the keyboard located at

 super + L2 + b

then use upload command:

 sudo avrdude -p atmega32u4 -c avr109 -U flash:w:filename.hex -P /dev/ttyACM0