The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1
 0  X  0  0  X  0 aX (a+1)X aX  X  X (a+1)X aX aX (a+1)X (a+1)X
 0  0  X  0 (a+1)X  X  0 (a+1)X aX (a+1)X  0 (a+1)X  X (a+1)X  X  X
 0  0  0  X  X  X  X (a+1)X (a+1)X (a+1)X aX  0 (a+1)X  X  0 (a+1)X

generates a code of length 16 over F4[X,sigma]/(X^2) who´s minimum homogenous weight is 44.

Homogenous weight enumerator: w(x)=1x^0+144x^44+828x^48+48x^60+3x^64

The gray image is a linear code over GF(4) with n=64, k=5 and d=44.
This code was found by Heurico 1.16 in 0.063 seconds.