The generator matrix

 1  1  1  1  1
 0  2  0  0  0
 0  0  2  0  0
 0  0  0  2  0
 0  0  0  0  2

generates a code of length 5 over GR(64,4) who´s minimum homogenous weight is 8.

Homogenous weight enumerator: w(x)=1x^0+35x^8+490x^16+3430x^24+12005x^32+229376x^35+16807x^40

The gray image is a code over GF(8) with n=40, k=6 and d=8.
This code was found by Heurico 1.16 in 0.321 seconds.