Nice Idea to have guidelines known for this. It will ensure quality and credibility as no one with no serious proposal would want to go through all the trouble if they are unsure of how far they can go with it.
And reverse for the ones with really good ones that know it can take blurt to the moon .
And as @merit.ahama rightly said the last guideline is a really good one..
Full support to the team
And continue to hope for a bright future of the community.