Some of the questions people have asked are answered in the specs page at
https://hartvr.wixsite.com/hartvr/specs . The webpage has a few details, but it doesn't say where they're going to launch from, and how they'll get FAA approval. I think launching from the ocean is the only way they could get approval. And one poster implied that they are anonymous, but the "About Us" page gives their names and a picture.
There is some question whether you can reach space with a single stage K rocket. The specs page states that they'll be able to achieve a velocity of 2,800 MPH. With a little math this works out to 49 miles. Adding the 19 miles from a balloon at 100,000 feet totals to 68 miles, so yes that is above the 62.5 mile definition of space. However, this assumes no air resistance. The air density at 100,000 feet is about 1% of that at sea level, but it's not zero. The air resistance of a rocket travelling at 2,800 MPH at 100k feet would be similar to traveling at 280 MPH at sea level. So there will be a significant drag on the rocket that would prevent it from reaching 62.5 miles.
I looked at this several years ago when I was involved with Team Prometheus, and determined that a 2-stage K-to-K rocket launched from a balloon could reach space. You should run a few simulations before you settle on the type of rocket that you'll need.
Your spec says that the launch rods are 5 feet long. These might be long enough for a ground launch, but I think they are to short for a balloon launch. The launch rod would probably need to be 10 feet or longer. Alternatively, you could put active guidance in your rocket, but this will add weight and complexity.
Another possibility is to pre-spin your rocket before launching. Here's a video I put together a few years ago to show how a spinning launcher would work.
[video=youtube;KO7IURt6fug]https://www.youtube.com/watch?v=KO7IURt6fug[/video]
You also have to consider how you will control the altitude of your balloons. Latex balloons typically fly to 100k feet, where they pop after expanding to 4 times its original diameter. If you want to launch vertically between the 3 balloons you probably need to space them out by 40 feet to ensure that there is a gap between the balloons. Also, balloons typically rise at about 10 to 15 MPH, so are you going to launch as the balloons continue to rise, but just before one of them pops? Or you could under-inflate the balloons so they don't pop at 100k feet, and release just enough helium at 100k to stop their ascent. This would require sophisticate electronics and some method to release helium. You would also need a way to cut away the launch platform after launch and recover it with parachutes.
There's a lot of work in a project like this, and its doubtful that you would complete it before graduating from high school. If you're lucky you might get it done before you graduate from college.