This contest seems to amount to "make a normal CTF level with these somewhat arbitrary rules, and win nothing." This would be more interesting if you were asking for something unique, or were offering some kind of award (even a small one). And awards can take a lot of forms - for example, a recent contest guaranteed that the winners would have their map in a prominent tournament, and minmay's somewhat odd contest seems to be rewarding a banner image or something.

I mean, I happen to have a CTF level in the works which almost fits under these rules, and while I could modify for these purposes, you're not exactly giving me a reason to do that.