G'day,
Nice work so far, a few points:
As Peter has already pointed out, the lowest note a violin can play is G3 (the g directly below middle C).
I think you should change the key from Dflat major to D major or another string friendly key. As a string player who hates Sight Reading (there are loads of us) five flats is a nightmare to look at. Also, D major is a lot more resonant on string instruments.
Some slurring directions (e.g. Violin I, Bar Five) are unplayable. In string music, slurs represent bowing. I wish good luck to any string player trying to play that passage in one bow.
Other than the above criticism, this work is going well. Hope to see the finished product.
Nga Mihi
Arjuna