With the single-mindedness of this thing, rigidity is probably not going to be a problem.
It's all carbon monocoque... Monoqouc ... Mont Blanc? I don't know how to spell that stupid word...
Anyway, I'd imagine it's built with similar methods as a LeMans open prototype, and nobody ever complains about those lacking rigidity without a top.
Now, decaptiate a Camaro or Mustang... it's a different story.
I hope one of these finds its way onto the same track as an FXX someday. Would't that be a case of the scrappy underdog taking on old moneybags. Except the scrappy underdog would have a mere offshore bank account in Nassau rather than the far superior Swiss-managed funds of the FXX pilot.
Wacky Racers. What a world.