Probably within 2 weeks from now a new update will be released.
With that update it will no longer be possible to craft Zeta MS. So anyone who still have materials left over should use them now.
Other changes will include new stats for MS and weapons, and some changes to how mining and crafting works.
Over the coming months there will be several updates which will take UCGO back to how it was when this server was first released and with some improvements.