I have collated the links to various Mek models that have appeared in these forums or at quadropolis. In most cases they will have a readme and are configured for the cube engine ready to go. I will update this post with new meka as they come off the production line.
Mek #6 - Human Walker - http://teamxbow.org/cube/models/models-mek/mek6_v04.zip
Chicken Walkers MD5 format(3 variants) http://teamxbow.org/cube/models/models-mek/mek_chicken_walker_pack.rar
Chicken Walker Base (Beholder) SMD format http://teamxbow.org/cube/models/models-mek/beholder_smd.rar
Chicken Walker Base (Beholder) MD3 format, NPC http://teamxbow.org/cube/models/models-mek/mech_a_REentity.rar
Droid MD3 NPC - http://teamxbow.org/cube/models/models-mek/droid_npc_RE.rar
Coming Soon - Mek #7 and #9. Number 9, Number 9........