Make Tetrapod In FreeCAD

So I've seen lots of maker/hacker/tinkerer types getting into making Tetrapods, those amazing 4 legged odd shapes deployed often as coastal protection. I've seen people sewing them, printing them and even casting them. As such I thought it might be a cool idea to show a quick and easy approach to modelling one with everyone's favourite opensource CAD environement #FreeCAD.