The generator matrix

 1  0  1  1  1  1  1  1  1  0  1  1  1  0  1  1  2  1  1  1  1  1  1  0  1  1  1 2a  2  1  1  1  1  1  1  1  1 2a  1 2a+2  1  1  1  1  0  2  1  1
 0  1  1  a 3a+3  0 2a+3 a+1  a  1  0 2a+3  a  1 a+1 a+2  1 2a+3  0 a+1 a+1  a  2  1 2a+3  2 3a  1  1 2a+1 a+3 3a  a 2a+1 2a+3  0 2a  1 3a+2  1 2a  3 2a+3  2  2  1  a  0
 0  0 2a+2  0  0  0  2  2  2  2  2  2 2a+2 2a+2 2a 2a+2 2a+2  0 2a+2 2a 2a+2  0  2 2a+2  0 2a  2  2 2a 2a  0  0 2a  2 2a  0  0 2a  0  2  0 2a 2a+2  0  2 2a 2a  0
 0  0  0  2  0  2 2a+2  0  2 2a+2  2  0 2a 2a+2  0  0  2 2a  2  0 2a+2  2 2a 2a+2  0  2 2a  2 2a+2  2 2a  2  2  0 2a  0 2a+2  0 2a+2 2a+2 2a  2  0  2 2a+2 2a+2 2a  0
 0  0  0  0 2a+2 2a+2  2 2a+2 2a  0 2a+2  2  2 2a  2  2  2  0  0 2a  0 2a 2a+2 2a+2 2a 2a+2  2 2a 2a 2a 2a+2 2a+2  0 2a 2a 2a  0 2a+2 2a 2a+2  2  2  2  2 2a+2  0  0 2a+2

generates a code of length 48 over GR(16,4) who´s minimum homogenous weight is 128.

Homogenous weight enumerator: w(x)=1x^0+72x^128+336x^131+351x^132+1092x^135+405x^136+2076x^139+693x^140+3096x^143+1062x^144+3384x^147+771x^148+1956x^151+429x^152+348x^155+195x^156+21x^160+33x^164+36x^168+18x^172+6x^176+3x^180

The gray image is a code over GF(4) with n=192, k=7 and d=128.
This code was found by Heurico 1.16 in 1.03 seconds.