are you using a scoring tool...and a straight edge...when scoring fold lines?
this is very important.
well scored lines are important.
but keeping straight folds straight, is even more important.
I'd say the buckling is due to the way the top of the sides are connected to the roof.
you said it was a fast build.
so...you got a little sloppy...thats all.
I suggest enlarging the driver's head a little
and reposition his pupils so he is looking forward (more upwards).
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