I was thinking that the source could become open to you only after you complete the mission. But people would still just throw the source all over the internet... anyone willing to actually learn wouldn't just go looking for the source though. It would work just like how people don't just look for how to get the answer because they wanna learn and figure it out on their own.
But this is a good idea, I would love to become a part of making this a reality. Creating full blown actual versions of HTS missions instead of put in the answer correctly to win. Have it so they actually have to exploit something instead of just know how to exploit something.
If I can get one other person who would be willing to code with me I will start this project on my server. Anyone?