While I understand that there is already a TF2 Customization, but within that there is also a HUD master thread. I feel that it would be better to have a HUD only forum. The reason that I think it's for the best is that it's easier for the creator to make and update his/her own thread. It would make it a little easier for the creator to bump the thread if/when it gets updated when an update hits.
Just a thought since I always thought model/game customization should have a different thread than HUDs, if only for cleanness.