RE: Top Flite 1/7 P-51 Build
bull51,
I hope you found out your problem with the W-2 rib. This step (not to rub it in) was a while back for me so I had to look at my build book and notes. And I just don't recall anything odd shaped about that spar cut out at all. Perhaps it had a chip out of it or something. Or you may be referring to the fact that the cut out in W2-W7 is larger because the spar is thicker from the root to the tip. Anyway you must of figured it out keep up the good work and don't rush it you'll do just fine. PS take notes on a note pad about your build this way if you need to build another one or make repairs (HOPE NOT) you can remember how you did it. This also comes in handy when building the other wing half if you've made a few modifications from the plans and instructions on the first half (and you will).
Your worst day flying is still better than your best day working!