Egg-Shaped Containers ~ The Trebuchet Project

I have an outline for a project I've been dreaming about doing for a long time. I want to use a trebuchet-launched paint projectile to paint upon the Arkansas River Levee. The projectiles themselves will be big enough to hold five gallons of acrylic house paint, an approximate fifty pound payload. My intent is to make them out of a thin-walled reinforced plaster which can withstand the sudden acceleration from the trebuchet, but not the sudden inellastic collision with the concrete berm of which the levee is made. In essence, I want to channel a once terrorising weapon built for destroying castles to paint a very inviting canvas that's been sitting there waiting for me for about eighty years.



I've started a rudimentary plan on the trebuchet.



I have also accessed one of the better target areas with Google Earth that is still rather blank, and sites from where I anticipate having the best ranging.