The generator matrix

 1  0  0  1  1  1  1  1 35  1  1  1  1  1  1  1  1  1  1  1
 0  1  0 36 31 16 35 17  1 48  1  9 34 18 19 28 29 38  2 13
 0  0  1  5 31 34 36  4 16 38  2 21 46 37 40 30 48 12 17  1

generates a code of length 20 over Z49 who´s minimum homogenous weight is 108.

Homogenous weight enumerator: w(x)=1x^0+168x^108+3276x^109+4536x^110+108x^112+588x^114+2016x^115+16380x^116+12096x^117+156x^119+14406x^120+3528x^121+6048x^122+33852x^123+20412x^124+24x^126+12x^133+42x^140

The gray image is a code over GF(7) with n=140, k=6 and d=108.
This code was found by Heurico 1.16 in 1.07 seconds.