The big problem that I see - structurally - is the front upright that connects to the down tubes.
They are just hanging out there with no triangulation and no tie ins or supports to the down tube itself.
Asking that one tube, that is typically already bent back at 5-15 degrees, to take the brunt of ANY impact is Russian roulette at best.
Does it work for now?
Possibly.
Cage less cars worked for decades too....