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  X  1  1  1  1  1  1  1  1  1  1  X  1  1  1  X  1  X  1  X  1  X  1  X  1  1  1  2  X  1
 0 2X  0  0  0  0  0  0  0 2X 2X 2X  0 2X  0  0 2X  0 2X 2X  0  0  0  0  0 2X  0  0 2X 2X 2X  0 2X  0  0 2X 2X  0 2X 2X  0  0  0  0 2X 2X 2X 2X 2X  0 2X 2X 2X 2X  0  0  0
 0  0 2X  0  0  0  0  0 2X 2X 2X 2X  0  0  0 2X  0 2X 2X  0  0  0  0  0  0  0 2X 2X 2X 2X  0 2X  0 2X  0 2X 2X  0  0 2X 2X 2X  0  0 2X  0  0 2X 2X 2X  0 2X  0  0  0 2X 2X
 0  0  0 2X  0  0  0  0 2X  0  0 2X  0 2X  0  0  0  0  0  0 2X 2X 2X 2X 2X  0 2X 2X  0 2X  0 2X  0 2X 2X 2X  0  0  0  0 2X  0  0 2X 2X 2X 2X 2X  0  0 2X 2X 2X  0  0 2X 2X
 0  0  0  0 2X  0  0  0 2X  0 2X 2X 2X  0  0 2X 2X  0  0 2X 2X 2X 2X 2X  0  0  0  0 2X 2X  0  0  0  0  0  0 2X 2X  0 2X 2X  0  0 2X 2X  0 2X  0 2X  0  0 2X  0 2X 2X  0  0
 0  0  0  0  0 2X  0  0 2X  0 2X  0  0 2X 2X 2X  0  0 2X 2X  0  0  0 2X 2X 2X 2X  0  0 2X  0 2X 2X  0  0 2X  0 2X 2X  0  0 2X 2X  0 2X 2X  0 2X  0  0  0 2X 2X 2X 2X 2X 2X
 0  0  0  0  0  0 2X  0 2X 2X  0  0  0 2X 2X  0 2X 2X 2X  0  0  0 2X 2X  0  0  0  0  0  0 2X 2X  0 2X 2X 2X 2X  0 2X  0 2X 2X 2X 2X  0  0  0 2X 2X 2X 2X 2X 2X 2X  0  0 2X
 0  0  0  0  0  0  0 2X 2X 2X  0 2X 2X  0 2X  0  0  0 2X 2X  0 2X 2X  0  0  0  0 2X  0 2X  0 2X 2X  0  0 2X  0  0 2X 2X 2X  0 2X  0  0  0 2X  0  0 2X  0 2X 2X 2X  0 2X  0

generates a code of length 57 over Z4[X]/(X^2+2) who´s minimum homogenous weight is 50.

Homogenous weight enumerator: w(x)=1x^0+39x^50+70x^52+83x^54+347x^56+1024x^57+330x^58+65x^60+38x^62+16x^64+11x^66+8x^68+7x^70+3x^72+4x^74+1x^76+1x^96

The gray image is a code over GF(2) with n=456, k=11 and d=200.
This code was found by Heurico 1.16 in 10.8 seconds.