Just post up pictures. As long as you say it's all WIP, there's no problem.
Nobody will go through the 'trouble' of setting up your menu files only to see one tiny little change. Post up pictures and show the world what magic you're doing
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And I don't think there's a need to make different threads. Just keep one thread where everything is discussed. And if you have new things to show, reply to this thread and post what you got. You might also want to post all your images (and possible download links) in the first post, so it's neat and tidy.
Good luck.