I saw the kit-bash digitigrade legs using the K9 mid-leg and I was not happy with the proportions.  I remixed the mid-leg frame piece to match the original Dummy13 shin length.

For digitigrade legs (walking on “toes”) I used the standard thigh, the mid-leg frame with the standard shin armor, and then the standard forearm frame and armor.  No custom armor is required for this leg configuration.

For unguligrade legs (walking on “hooves”) I used the upper-arm frame with my modified thigh armor, the mid-leg frame with the standard shin armor, and the standard shin frame with the modified forearm armor. 

Both of these options will require printing the mid-leg frame piece, and an extra knee / elbow frame piece per leg.