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  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
 0 2X+2  0 2X+2  0 2X+2  0 2X+2  0 2X+2  0 2X+2  0 2X+2  0 2X+2  0 2X+2 2X  2  0 2X+2 2X  2  0 2X+2 2X  2  0 2X 2X+2  2 2X  2 2X  2 2X  2 2X  2  0 2X 2X+2  2 2X  0 2X+2  2 2X  2  0 2X 2X  0 2X+2 2X+2
 0  0 2X  0  0  0 2X  0  0  0  0  0 2X  0 2X  0  0 2X  0 2X  0 2X  0 2X 2X 2X 2X 2X 2X 2X 2X 2X 2X  0 2X  0 2X  0 2X  0  0  0 2X 2X  0 2X 2X  0 2X 2X  0  0  0 2X 2X  0
 0  0  0 2X  0  0  0 2X  0  0  0  0  0 2X  0 2X 2X 2X 2X 2X 2X 2X 2X 2X 2X  0 2X  0 2X 2X  0  0  0 2X  0 2X  0  0  0  0 2X 2X 2X  0  0 2X 2X 2X 2X 2X 2X 2X  0 2X 2X  0
 0  0  0  0 2X  0 2X  0  0 2X 2X 2X 2X 2X  0 2X 2X  0  0 2X 2X  0  0 2X  0 2X  0 2X 2X 2X  0  0  0  0 2X 2X  0 2X 2X  0  0 2X 2X  0 2X 2X 2X 2X 2X  0  0 2X 2X  0 2X  0
 0  0  0  0  0 2X  0 2X 2X 2X 2X  0 2X  0 2X 2X  0  0  0  0 2X 2X 2X 2X  0  0 2X 2X 2X  0 2X  0  0  0  0  0 2X  0 2X  0 2X  0 2X 2X  0  0  0 2X 2X  0  0 2X 2X 2X  0  0

generates a code of length 56 over Z4[X]/(X^2+2) who´s minimum homogenous weight is 52.

Homogenous weight enumerator: w(x)=1x^0+27x^52+8x^53+26x^54+120x^55+659x^56+120x^57+32x^58+8x^59+17x^60+5x^62+1x^110

The gray image is a code over GF(2) with n=448, k=10 and d=208.
This code was found by Heurico 1.16 in 0.156 seconds.