Target Practice is a great example of a teacher using what she has, teaching a new concept in a practical way and having students stretch beyond their grade level within math.
The video is a bit long but you can easily write out a lesson plan as you follow along. There's also a great tip about compasses and large circles, with reference to another video. Even if all you take from this video is that reference, it's worth it.
A nice little project with the outcomes being students that understand the concept, build something together, expand their knowledge and enjoy themselves in a math class. Sounds like something to pay attention to to me.