I've never seen a pic. of that car. An interesting twist on the Lotus 7 style. I was surfing the site & ran across this thread. I'd think the 40 could certainly get warm in the summer being rather small area of the interior. I think I'd hinge the window at the top with a latch at the bottom. They could actually open all the way if properly designed. Make it easier when you go through the drive up window for that big gulp & a burrito:lipsrsealed: LOL
Mike S