This is one of my favourite pieces of music of all time. I have seen a few orchestras playing it and I usually feel they are in a hurry to get the first movement over with - I don't know why. So starting with M. A. Kesnevic's excellent midi file (on ClassicalArchives.com) about a year has been spent turning this into something I am now really pleased with and is how I'd present this piece if I were a conductor! (I can already hear people saying thank goodness he isn't one). OK there are a still a few AK47's in there, but its done with a sample library!
The brass is SAM Brass (mostly the free demo samples), the rest of the Orchestra all GPO, and 'scoring noises' are the free Beladmedia ones posted here a while back.