The generator matrix

 1  0  0  0  1  1  1
 0  1  0  0  1 2a+2  0
 0  0  1  0 3a+3  1  0
 0  0  0  1  1  a  2
 0  0  0  0 2a+2 2a 2a+2

generates a code of length 7 over GR(16,4) who´s minimum homogenous weight is 8.

Homogenous weight enumerator: w(x)=1x^0+9x^8+48x^9+120x^10+972x^12+576x^13+480x^14+3840x^15+8403x^16+2592x^17+20112x^18+23040x^19+24912x^20+54336x^21+57696x^22+34560x^23+24963x^24+3888x^25+1464x^26+132x^28

The gray image is a code over GF(4) with n=28, k=9 and d=8.
This code was found by Heurico 1.16 in 5.19 seconds.