I think it would be best to just start fresh. That way everyone starts out equally. And I'm also for avoiding remakes altogether. The purpose of the contest should be to promote new and original maps. But, I like the idea of being transparent throughout development. It's a good way to see maps taking shape from blockout to final version. Last time everyone was holding out until the very end to avoid other people taking "inspiration". That's also a fair point, but it's less likely that somebody is going to straight out just copy your idea.
Also, we've put fourth the idea of allowing mapcore staff/moderators that are not on the judge panel to participate in the contest. While nobody seemed to mind in the Discord and encouraged the idea, it's good to also talk about that here just so that there are no issues down the line. I know that I'd like to be participating in this one and maybe @'RZL as well.
Regarding the judge panel, a lot of people have been vocal that they would like to see more industry professionals. Something else to discuss.