I've got a pretty sick backyard, as I've built a small figure-8 track for my daughter to shred on her Kawasaki Elektrode and KFX 50. And I can send it on the track myself, so long as I treat it like a flat-track course and just slide the hell out of the two corners.
There are also two small single-track sections I'm developing to have some fun on. Plus a work-in-progress 3D archery course. Suffice it to say, I'm spoiled. But my little backyard fun is nothing like Grind Hard Plumbing Co.'s insane track they've built. Nor is my garage as stocked as theirs in terms of wild builds to throw at the track.