Cool idea - I reckon you should double the horn section - add a harmony or almost duplicate group and throw them on the other side with a good chunk of reverb across both.
The horn solo is fine but seems odd not having the centre of the stereo image when the vibes - whilst stereo, seem centred.
The main melody is a little bright and could use a little top end roll off.
Nice work.


Cheers
rayc
"What's so funny about peace, love & understanding?" - N.Lowe