This is great. The arrangement and intonation are as good as you can expect from a piece constructed under such conditions.
I've been waiting for years for something like this to pop up. It is impossible to make chamber music sound very good with samples or amateur musicians, which is why this community hasn't seen any (I think?) before now. The lack of a lower range sounded strange to me at first, but I think that your arrangement has dealt with this well. I really hope you submit more to OCR, because this is sweet and there are only a few (such as po!) violinists around.