Please give us some feedback on what you would prefer regarding the builds section. Some members have mentioned more detailed or focused boards and these are great ideas so we want to get your feedback.
Maybe have a "completed purist MOCs" and a "completed customs" board.
This keeps it pretty simple and all WIPs, custom or otherwise, can share a board, since there seem to be a lot fewer of them.
Not totally in love with the above idea, but thought I'd throw it out there for discussion.
If I was to split things I think I keep it fairly straightforward with the separate Castle and non-castle forums. In these forums you could have sub-forums for MOCs, WIPs and anything fig related (3rd party customs or otherwise).