Just come back with something new when you have developed more. You need to do more modification than just recolors for people to consider it an independent HUD. That's all. You will still have haters because everyone's taste is different, but at least you'll have something you can call your own. Jarate is right, it takes years. I've been modifying and maintaining my own HUD for 4 years and I'm still learning. Just take your time and learn the things you admit to not having figured out. You will be much more well received with your own product instead of what is still essentially someone else's.
I don't know how much reading you've done, but I'm still always referencing Doodle's guide. Start there if you haven't already.