I think you have the makings of a very nice rifle from what you've described. I'm building a very similar rifle...using a T&T'd dual port action for a 6mm Dasher ( 6 BR improved )...but I went with a 27" MTU contour Krieger barrel for my own reasons. I have a McGowen 30" straight taper barrel on my .308 BVSS and I've been very impressed. Again...I think you're on the right path, IMHO...for what you want to build.

Good Luck,

Wayne