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Encourage you to implement everything. Then simply gather feedback as you go. Some aspects will work better than others, which is to be expected.
Altho' a relative newbie on CF, I'm a long time member/contributor at Marketing Profs. Much of what you've proposed mirrors the model of activities on that forum. And that's a good thing!
One minor drawback with having a marketplace in close proximity to a feedback forum is the tendency for some reviewers to promote their own capabilities under the guise of help and advice. For example: ...you could improve the whatnot by using the such-and-such found in my toolbox.
Another drawback I've noticed occurring on Marketing Profs, is the tendency for non-designers to solicit ideas for free. Real estate agents who want help with naming, logo ideas, tagline, website structure etc. but are too cheap to engage a professional go fishing for naive members to ripoff.
You'll have to be vigilant and rigorous with your admin skills.
Hope this helps.
