The generator matrix

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

generates a code of length 70 over F4[X,sigma]/(X^2) who´s minimum homogenous weight is 203.

Homogenous weight enumerator: w(x)=1x^0+744x^203+300x^204+984x^207+303x^208+468x^211+234x^212+396x^215+60x^216+228x^219+36x^220+156x^223+60x^224+96x^227+27x^228+3x^244

The gray image is a linear code over GF(4) with n=280, k=6 and d=203.
This code was found by Heurico 1.16 in 0.141 seconds.