I've been meaning to listen to this for a while. Love Beethoven, the samples are good but the strings lack a little clarity for me. Particularly the bass. There also seems to be a couple of off notes, too. I too make mistakes when sequencing orchestral peices. By the way I use Notion 3 which is a orchestral, score, sequencing instrument.
The mix lacks a little punch for me too, this has to big and punchy in the loud sections.
But I am being picky and finicky. This is an epic job and well done.
Peace Ben