Actually, thegit is right regarding the rivet situation.
My comment is loosely based on the Elise video again. I played the grooves out of that video for about nine years while I prayed that the car would be imported. In one video segment, one of their test engineers illustrated the peel stress resistance of a glued test joint versus one that was also reinforced by rivets at the corners. Although the strength of the bonded joint was sufficient, the controlled tests pointed them towards using rivets for additional crash strength. Having rivets does not undermine the innovative use of epoxies in the Elise; the rivets were simply added to further improve the Elise's safety.
Arno, are you out there? I'll bet the self-proclaimed "nerd" could shed further light on this...