Laminated windshield is fine. A plain ol check valve in the cap is a little lacking imo. What's better imo is a sealed cap and a dedicated vent off the tank with a racing type roll over valve. But the whole 3 planes thing is totally not necessary. If it was required, it'd be in the rule book. Case in point, I've seen/heard a few inspectors telling competitors coming through tech to do this over/under/around vent hose thing which is not required so I put in a rule change request to make it a requirement. If all the inspectors are telling competitors to do something then that thing should obviously be adapted as a rule. Anyways, my request was turned down which verifies that the 3 plane vent thing is not a rule therefore is not required. If you have a problem with this in the future, just talk to kiwi steve (assuming he's actually there).