it's looking great! that's about what my first (plywood) one weighed at that point (25lbs with threaded inserts and herculiner finish), my second one came out to 23lbs at that stage. i'm a little surprised that the nidacore isn't really much lighter, but you do have much heavier handles on your's.
i would guess, depending on what type of grill and covering that you use, that it'll come in at 46-50lbs, which is a feather for a 215 cab that size.
keep up the good work!
I love 2x15 cabs.
Jorg Schroeder built me a custom 2x15.
No tweeter, vertical, came in at 45 pounds.
That and my GB Streamliner, my rig comes in at 51 pounds.
And sounds amazing.