The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2  1  1  1  1  1  1  1  2  2  2  2  2  1  1
 0  2  0  2 2a+2 2a+2  0  2 2a+2  0  2 2a+2 2a 2a 2a 2a  0  0  2  2  0 2a 2a  0  2  2  2  2 2a  0 2a  2  0 2a 2a  2 2a 2a 2a+2 2a+2 2a+2 2a+2
 0  0  2 2a+2 2a+2  2 2a 2a  0 2a+2  2 2a  0  2 2a 2a+2  0  2 2a+2 2a 2a  2 2a+2  2 2a+2 2a  2  2 2a 2a+2  0  0  0  0  2 2a  0 2a  2  0 2a+2 2a

generates a code of length 42 over GR(16,4) who´s minimum homogenous weight is 124.

Homogenous weight enumerator: w(x)=1x^0+186x^124+9x^128+48x^132+6x^140+6x^144

The gray image is a code over GF(4) with n=168, k=4 and d=124.
This code was found by Heurico 1.16 in 0.063 seconds.