Gosh, that's amazing.
I'm very fond of the "Grandioso" and "Molto Allegro" parts (m140), those big chords and dissonances really got me.
Also, the theme is amost identical to Camargo Guarnieri's 2nd Symphony. He was a Brazillian composer, and one of my biggest influences. He's also uses quartal harmonies a lot. If you never heard it, please do. Here's a link for a recording of it. You can here the theme at 1'00"
I'm exited to listen to the last movement (and will also check the previous movements aswell). Keep at it!