Less common alternate layouts

Colemak-curl

This is a fairly common alteration to the Colemak layout, in which a bunch of keys on the middle rows are moved around to decrease lateral movement in favor of curling:

To switch from the QWERTY map to the COLEMAK-curl map you will need to do two things.

First, add this one below, say, QWERTY:

  [CMKCURL] = KEYMAP_STACKED
  (___,          Key_1, Key_2, Key_3, Key_4, Key_5, Key_LEDEffectNext,
   Key_Backtick, Key_Q, Key_W, Key_F, Key_P, Key_B, Key_Tab,
   Key_PageUp,   Key_A, Key_R, Key_S, Key_T, Key_G,
   Key_PageDown, Key_Z, Key_X, Key_C, Key_D, Key_V, Key_Escape,
   Key_LeftControl, Key_Backspace, Key_LeftGui, Key_LeftShift,
   ShiftToLayer(FUNCTION),

   M(MACRO_ANY),  Key_6, Key_7, Key_8,     Key_9,         Key_0,         Key_KeypadNumLock,
   Key_Enter,     Key_J, Key_L, Key_U,     Key_Y,         Key_Semicolon, Key_Equals,
                  Key_M, Key_N, Key_E,     Key_I,         Key_O,         Key_Quote,
   Key_RightAlt,  Key_K, Key_H, Key_Comma, Key_Period,    Key_Slash,     Key_Minus,
   Key_RightShift, Key_LeftAlt, Key_Spacebar, Key_RightControl,
   ShiftToLayer(FUNCTION)),

Next, replace this line:

enum { QWERTY, FUNCTION, NUMPAD };

with this one:

enum { CMKCURL, QWERTY, FUNCTION, NUMPAD };

Then flash the firmware to your Model 01 following these instructions, and you'll be all set!