I just started playing this, and I found it quite strange that a game with such great reviews AND has a SDK is so barren for custom multiplayer maps. I've found a grand total of like, 8. I spent a nice amount of time last night just browsing old clan sites and Massive's forum, and every link I found was dead and unrecorded in the web archive.
So simple question, is there any online site that has a collection of maps?

As i remember GC wasn't mod friendly even with SDK, Also maps in that GC are pain in ass to do. Look earth series same problem. Also a lot of people moved from GC1 to GC2 like modders of homeworld 1 to homeworld2.