Sunken Trampoline - worth a read before installing, love the grass covering
Safe and Cool: A Sunken Trampoline For Kids
Dimensions for sunken trampoline
Trampoline Magic Night Lights | Capital Play
partially sunken trampoline.... I would consider this. this might be good. I don't like the fully sunken ones though because you have to have such a deep hole, and you need vents for the air to escape or else it won't bounce.
Noodle Trampoline Springs | The WHOot
Crazily detailed instructions on how to build a sunken trampoline.
Buy Plum 8ft In-Ground Trampoline Online at johnlewis.com
Projects to Try