Don't mean to beat this to death, but I think the Brasila's a good looking car. I don't think that of the 411/412. The styling is similar, but the parts aren't interchangeable, and if you look closely they look subtly different. To me, anyway. What do you think?
VW 412E front:
Brasilia front:
The headlight surrounds look very similar, but if you see them up close it's obviouls they're different.
Brasilia rear (sorry couldn't find a better photo):
VW 412 Variant rear:
It's a much shorter and lighter overall car too. Brasilia side view (ditto the bad photo):
I can't find anything to support it, but I know the Brasilia had a different chassis. Do you know the Puma cars? Until the late 70's they were built on Karmann Ghia chassis, and when VW discontinued the KG in Brasil Puma switched from the KG chassis to the Brasilia. The Brasilia chassis was similar to the KG in that the pans were wider and extended farther forward wider than the T1 pans. It's the same for the U.S. chassis for those cars here, you can't weld T1 pans into a KG, you need special KG pans. Similar, but not the same.
Other thing, the Brasilia didn't use a pancake motor, it was an upright T1 with a very short shroud so the car didn't have a low station wagon style rear deck.
Here, found something:
www.geocities.com/vw_brasilia/historiabras.htm, where it says in translation "With hands at work, the first difficulty, soon overcame, the choice of the plataform, that should be the one from the Beetle. But as it was too narrow, providing few inner room, they tried a Ghia Type 1 size-similar chassis, that was perfectly suitable."
Read some more of that article, lots more comprehensive than Wikipedia and comes from the source.