I would have to agree that an aftermarket bench seat would provide better overall support, however with a 4 point harness to accompany this homemade job, its very safe. This seat is a quality well thought out and engineered product. Hooks in the bottom plate and around the rear roll bar cage. It stays completely stationary. It weighs 25 pounds, and is powdercoated. Unfortunately my friend is not making more. Heres a few pics to give a an idea if you want to build your own.If safety is your priority (and I don't know many parents whose #1 priority isn't safety) I'd go with an aftermarket bench with a child seat in the middle.