Would it maybe work to give a build a style and function so that people could choose to search/browse by either? I was thinking something like:
Style:
Medieval
Futuristic
Houses
City/Mic. Buildings
Terrain
Misc.
Function:
Deathmatch (Subcategories by gamemode?)
RPG
Demo
Challenge
Event
General Purpose
Appeal
And probably also have top rated/featured builds. What would be neat is if maybe every week a few builds were selected to be featured as a featured build for that week, the number depending on the number of build submissions recently.
It would also be cool if you integrated it with RTB Clan (which I can't use) by allowing people to select a "Clan App" option and enter the name of the clan, the leader/members will recieve a notification (depending on a setting changable by the clan leader?) and can vote yes/no (or another method, perhaps also selectable by the clan leader), if the app is accepted then it will be indicated on the build's page, and if it is denied it will also be indicated.