Looks fine to me. Move it over to the LSC! They might add also an examples for unofficial files and structure. Kind of:
928 - Galaxy Explorer.mpd
with
928-1 Minifig.ldr
928-1 Buggy.ldr
928-1 Ship.ldr
928-1 ...
w.
928 - Galaxy Explorer.mpd
with
928-1 Minifig.ldr
928-1 Buggy.ldr
928-1 Ship.ldr
928-1 ...
w.
LEGO ergo sum