The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1
 0  3  0  0  0  3  3  3 3a 6a+3  0  3
 0  0  3  0  0 3a+6 6a+6 3a  6 3a+6  3 3a+6
 0  0  0  3  0 3a+6  3 3a+3 3a+3 6a+6 6a+3 3a+6
 0  0  0  0  3 6a+6  6 6a+3  3  3 3a 6a+6

generates a code of length 12 over GR(81,9) who´s minimum homogenous weight is 63.

Homogenous weight enumerator: w(x)=1x^0+1072x^63+1840x^72+6000x^81+14120x^90+472392x^96+19760x^99+16256x^108

The gray image is a code over GF(9) with n=108, k=6 and d=63.
This code was found by Heurico 1.16 in 8.28 seconds.