You can make it as heavy as you want. Install an eyebolt in the top and when you get to that tree, run the canopy under a limb that is high enough to clear, tie the canopy to the limb, lose the canopy, mow the grass under the low limbs and then hook back up to your canopy and go about your business. If you build it too light you stand the chance of vibration cracks in the structure. A little heft can can also keep it from disintegrating from a light brush up against something solid.